Your baselayer may not be the most exciting part of your layering system, but make no mistake: It’s certainly one of the most important. As a next-to-skin piece, baselayers are tasked with pulling moisture away from your body and regulating your core temperature, which is especially useful for outdoor activities like skiing, hiking, and climbing. Our female staff has tested dozens of baselayers to bring you our 19 favorites below, from premium, warm, and naturally odor-resistant merino wool options to cheaper synthetic alternatives. For more information, see our women’s baselayer comparison table and buying advice below the picks. For a wider look at the market, we've also compiled a round-up of the best baselayers, which covers both men's and women's styles.

Editor’s note: We updated our women’s baselayers round-up on April 18, 2024, to add the Arc’teryx Hallam Merino Wool Hoody—a premium design that looks the part both outdoors and around town. We also included information about our testing process and combed through the guide to ensure prices, colorways, and product write-ups are current at the time of publishing.

Our Team’s Women’s Baselayer Picks

Best All-Around Baselayer for the Cold

1. Smartwool Classic Thermal Merino 1/4 Zip ($120)

Smartwool Classic Thermal Quarter Zip baselayerCategory: Mid/heavyweight
Material: 100% merino wool
Weight: 250g/m² 
What we like: Extremely warm, soft, and resistant to stink.
What we don’t: Too thick for high-output activity.

Merino wool is our favorite baselayer material for many reasons: It’s soft and comfortable, provides incredible warmth for the weight, and effectively wicks moisture away from your skin. Smartwool’s popular Classic Thermal is a shining example, combining all the performance benefits of wool in a well-built and good-looking package. With a fairly heavy dose of pure merino (250g/m²), the Classic Thermal is built to keep you warm during winter activities like resort skiing and snowshoeing, yet is still cozy enough to wear around the house on snow days. Fit-wise, the women's version is fairly snug, but added give in the fabric means it effectively breathes and wicks sweat without feeling restrictive. And for active use or warmer days, we really appreciate the ability to dump excess heat via the 8-inch zipper at the top (which also allows the layer to slide on nicely over a helmet).

All that said, merino wool does have its downsides. First and foremost, the material doesn’t come cheap, and the Classic Thermal is pricey at $120. If you’re on a tight budget and don’t mind compromising in areas like comfort and odor resistance, you can save considerably with one of the polyester options below, including Patagonia’s popular Capilene. Polyester is also inherently more durable than merino and wicks moisture more effectively, making it a better choice for sweat-inducing activities. But for resort skiing, mellow snowshoeing, and casual days around town, the comfort and warmth of wool are well worth its inherent trade-offs, making this Smartwool our favorite cold-weather baselayer this year. And if you like the warmth and construction but prefer a lower-profile collar, it’s also sold in a Crew Top for $5 less, as well as matching bottoms of different lengths.
See the Smartwool Classic Thermal Merino 1/4 Zip


Best Synthetic Women’s Baselayer

2. Patagonia Capilene Midweight Crew ($79)

Patagonia Capilene Midweight Crew baselayerCategory: Midweight
Material: 100% polyester
Weight: 147g/m² 
What we like: Polyester is more affordable, durable, and breathable than wool.
What we don’t: Less soft and doesn’t resist odor as well as a merino baselayer.

As we touched on above, polyester baselayers typically are cheaper and more durable than their merino counterparts, and are much better suited for intense activity. Our top synthetic pick this year is Patagonia’s Capilene Midweight Crew, which will save you around $40 compared to the Smartwool above while still offering great all-around performance. In addition to improved moisture-wicking, the Capilene feels smooth against the skin, features thoughtful touches like low-profile thumb loops and underarm gussets, and is made with 100% recycled materials (a nice nod to Patagonia’s ongoing sustainability focus). Long-term durability is the cherry on top—we have Capilene tops that are multiple years old and showing minimal wear despite heavy use.

What do you sacrifice by opting for a synthetic baselayer? While the Capilene is comfortable for a polyester design, it’s still a tangible step down in softness compared to the merino competition. Further, despite Patagonia’s HeiQ Pure anti-odor treatment, it builds stink more readily and will require fairly frequent washing. And unrelated to the construction, the Capilene is dubbed a “slim fit” by Patagonia, which may not work for some body shapes (it’s noticeably trim around the waist in particular). But maintenance is a breeze (you can throw it in the dryer with other clothes), and not everyone wants to spend $100 or more on a baselayer, which is why we love Patagonia’s Capilene collection.
See the Patagonia Capilene Midweight Crew


Best Budget Women’s Baselayer

3. REI Co-op Midweight Long-Sleeve ($55)

REI Co-op Midweight Long Sleeve women's baselayerCategory: Midweight
Materials: 92% polyester, 8% spandex
What we like: Similar warmth as the Smartwool Classic Thermal above at less than half the price.
What we don’t: Not a standout in odor resistance and runs small. 

It’s not cheap to assemble a winter layering system from scratch, but the good news is there are a number of affordable, well-built baselayers on the market. REI Co-op’s Midweight Long-Sleeve Base Layer Top is a crowd favorite: For just $55 (less than half the price of our top-ranked Smartwool), the REI is warm, regulates temperature well, and has helpful touches like flat seams and four-way stretch to minimize bulk and maximize mobility (respectively). As we’ve come to expect from REI, the Midweight Long-Sleeve also comes in a nice variety of size and colorway options, from classic black and navy to bright yellow. It’s also offered in a half-zip option for just $5 more.

REI’s Midweight is an undeniably enticing value, especially considering the long-term durability advantage over merino wool. That said, although the Co-op’s fabric is comfortably silky, it can’t compete with merino or even Patagonia’s Capilene above in terms of softness and comfort. It’s also more prone to holding in body odor, which means you’ll probably find yourself putting the REI through the wash more often. Finally, this top lacks thumb holes—this won’t be a deal-breaker for most, but they do make it easier to add layers overtop. All that said, we keep coming back to value: The REI Midweight is an unquestionably well-built baselayer for the price, earning it our endorsement as the top budget pick this season.
See the REI Midweight Long-Sleeve


Best Women's Baselayer for Active Use

4. Smartwool Intraknit Thermal Merino Crew ($130)

Smartwool Intraknit Thermal Merino Crew baselayerCategory: Midweight
Materials: 53% merino wool, 45% polyester, 2% elastane
Weight: 200g/m²
What we like: A merino baselayer that’s purpose-built for high-output activities.
What we don’t: Trim fit and technical appearance limit overall appeal.

The top-ranked Smartwool Classic Thermal is a great choice for activities like resort skiing and snowshoeing, but it’s too warm for heart-pumping uses like cross-country skiing or backcountry touring. Enter the Intraknit Thermal, which is tailor-made to keep you comfortable when working up a sweat in cool to cold conditions. Compared to the Classic Thermal’s all-merino build, the Intraknit’s healthy amount of polyester (45%), along with the addition of mesh ventilation zones in heat-prone areas like the upper back and core, results in a sizable boost in both breathability and durability. For reference, we’ve worn the Intraknit for all sorts of cardio-intensive winter pursuits—from Nordic skiing to breaking trail in waist-deep powder—and found the balance of warmth and breathability hard to beat. Plus, you still get all the benefits of merino, including solid odor resistance and a soft-next-to-skin feel.

In deciding which Smartwool baselayer is right for you, the main consideration is end use. If you’re looking for a more casual piece to wear both on the slopes and to après, the Classic Thermal’s more generous fit and less technical appearance will likely give it the edge (we also wear it a lot as an outer layer while hiking or backpacking). On the flip side, the trim-fitting Intraknit is more ideal as a next-to-skin piece for active pursuits and will dump heat much more effectively (our go-to combination is the Intraknit and a windbreaker jacket). Finally, it’s worth noting that Smartwool also makes the Intraknit Active, a thinner variation that’s well suited for mild conditions... Read in-depth review
See the Smartwool Intraknit Thermal Merino Crew


Most Durable Women’s Baselayer

5. NW Alpine Black Spider Hoody ($135)

NW Alpine Black Spider Hoody blue (women's baselayers)Category: Midweight
Materials: 93% polyester, 7% spandex
Weight: 197g/m² 
What we like: A highly durable baselayer that can pull double duty as an outer layer.
What we don’t: Pricey for the construction; not as soft or warm as merino offerings.

The baselayers above are great for wearing under a shell and/or midlayer, but NW Alpine’s Black Spider Hoody stands out for how well it functions when worn by itself. The Polartec Power Grid fabric is warm and comfortable but highly resistant to tears and abrasion thanks to the tight weave, and the touch of spandex adds a nice dose of stretch for mobility-dependent activities. For reference, we’ve put ours through more than eight years of climbing abuse—much of the time without a jacket over the top—and it has yet to develop any holes or tears. The rest of the design is equally well executed, including a long cut that stays put under a hipbelt or harness, low-profile hood that fits under a helmet, quarter-length front zipper, small chest pocket, and thumb loops.

It's important to note that NW Alpine Black Spider Hoody is not your standard baselayer—with a roomier fit and great standalone performance, you'll probably be layering it overtop a tank top or T-shirt. It's a bit bulkier than most of the competition, noticeably less soft than merino offerings, and—in our experience—doesn't measure up in terms of warmth-for-weight. Further, $135 is a hefty price tag for a polyester baselayer, and the Black Spider can often be hard to find in stock online or in stores. But this top is nevertheless impressive in terms of durability and versatility, which set it apart as a highly functional and long-lasting performance piece.
See the NW Alpine Black Spider Hoody


Best of the Rest

6. Ridge Merino Aspect Merino Wool High Neck ($80)

Ridge Merino Aspect Merino High Neck (women's baselayer)_Category: Midweight
Materials: 84% merino, 16% nylon
Weight: 180g/m²
What we like: Fun style, great fit and finish, and a Golidlocks level of warmth.
What we don’t: The high neck style doesn’t ventilate well.

A family-run operation based out of California’s Eastern Sierra, Ridge Merino offers a small collection of high-quality yet affordable merino wool baselayers. Their Aspect High Neck Top quickly became our go-to long-sleeve last season. Its 180-gram weight is just the right thickness for mild conditions or high-output activities, and it’s so soft and cozy that we can’t help but wear it around home, too. What’s more, the turtleneck is a refreshing change from standard crew and quarter-zip styles and is long enough to extend over the face for added coverage. To top it all off, the Aspect High Neck is just $80 (the crew is $75), making it one of the most affordable merino wool baselayers on the market.

Similar to other lightweight merino offerings (like the Smartwool Classic All-Season below), Ridge added 16% nylon to help strengthen the Aspect’s thin merino wool build. They’ve also done a great job paying attention to the finer details: The Aspect High Neck features well-designed thumb loops that disappear into the cuffs, a very discreet headphones port (though we question the utility of this addition), and a long cut that doesn’t ride up. Added up, we’re very impressed with the Ridge Merino: For mild conditions or high-intensity activities in colder temperatures, it’s one of our favorite designs on the market (you can also opt for a quarter-zip version for better temperature regulation). It's also worth mentioning Ridge Merino’s heavyweight Inversion, which features thick (270g/m²) 100% merino wool.
See the Ridge Merino Aspect Merino High Neck


7. The North Face Summit Pro 120 Crew ($100)

The North Face Summit Pro 120 women's baselayer_Category: Light/midweight
Materials: 100% polyester
Weight: 120g/m²
What we like: Cozy warmth alongside great breathability and moisture-wicking.
What we don’t: Around $20 more than the Patagonia Capilene Midweight above.

The Patagonia Capilene is our favorite synthetic baselayer this season, but The North Face’s Summit Pro 120 still turns up the performance dial. The biggest news with the 100%-polyester Summit Pro is its DotKnit fabric, which boasts small holes to help boost temperature regulation. In testing, we were very pleased with the baselayer’s ability to retain warmth while effectively dumping excess heat and managing moisture during intense activity. Additionally, we found the trim fit to be well suited for serious movement (importantly, it’s not so snug that it restricts movement).

As we mentioned above, we almost always prefer synthetic over wool for mild conditions or when we anticipate working up a sweat (the Intraknit Thermal above is a notable outlier with 53% merino). And while synthetics don’t always measure up to wool in terms of fit, finish, and comfort, the Summit Pro is a notable outlier: The next-to-skin feel is excellent, and our shirt has only collected a couple of snags after a year of consistent use. The high-performance design will cost you around $20 more than the Capilene Midweight, but those who routinely generate a sweat will likely find the extra investment worth it.
See The North Face Summit Pro 120 Crew


8. Icebreaker 200 Oasis Crew ($105)

Icebreaker Oasis 200 Crew (women's baselayer)_Category: Midweight
Material: 100% merino wool
Weight: 200g/m² 
What we like: Excellent balance of breathability and warmth.
What we don’t: Some won’t love the technical fit. 

New Zealand-based Icebreaker may lack the name recognition of brands like Smartwool and Patagonia, but make no mistake: This merino wool specialist is the real deal. The popular 200 Oasis Crew here is a testament to their top-end quality: It’s made from 100% merino wool, is super soft, and has a performance fit that works well for skiing and cool-weather hiking. We also appreciate Icebreaker’s sustainability focus and transparency about production practices, including working closely with local sheep farmers to ensure that animals are treated humanely with access to clean water, adequate nutrition, shelter, and open pastures. 

Our main gripe with the 200 Oasis is its snug fit, which tends to ride up around the midsection and doesn't layer well over a T-shirt. As a result, we don't recommend this piece if you anticipate wanting to wear your baselayer as a standalone piece (it's not a great choice for hiking), but the skin-tight design is nevertheless warm and low-profile under a midlayer. And compared to the Smartwool Classic Thermal above, the Icebreaker's dense weave doesn’t release hot air quite as efficiently—despite having a lighter fabric weight (200 vs. 250g/m²)—and can start to feel muggy when you’re working up a sweat. But the Oasis does wins out in next-to-skin softness, and it's hard to knock the premium craftsmanship. For resort or backcountry skiing and other winter use, it's a simple yet high-end merino baselayer that delivers a good dose of warmth.
See the Icebreaker 200 Oasis Crew


9. Smartwool Classic All-Season Merino ($90)

Smartwool Classic All-Season women's baselayerCategory: Light/midweight
Materials: 88% merino wool, 12% nylon
Weight: 150g/m² 
What we like: Light and breathable enough for year-round use.
What we don’t: Thin materials require more care.

Smartwool’s Classic Thermal above is our favorite baselayer for cold weather, but it’s decidedly overbuilt for mild conditions. For warmer temperatures, their Classic All-Season is similarly well built but noticeably thinner (150g/m²) and more breathable. Additionally, unlike the Thermal’s pure wool construction, the All-Season adds 12% nylon to the mix for a boost in durability, and weight goes down significantly from 8.3 ounces to a scant 4.7 (the lack of zipper helps). In other words, you’re still getting the coziness and moisture-wicking capabilities of merino wool, but in a much lighter and airier-feeling package.

All told, the Classic All-Season is a nice match for demanding winter activities like cross-country skiing and cold-weather running. The lightweight construction also makes it appealing for more casual outings in milder temperatures, including shoulder-season hikes and hanging out in camp on cool summer nights. However, the trade-off to the Classic All-Season’s thinner build is that it’s more prone to developing holes and tears, especially if you regularly throw it in the dryer. But we love the Smartwool’s combination of comfort and breathability, earning it a respectable finish on our list this season.
See the Smartwool Classic All-Season Merino


10. Outdoor Research Echo Hoodie ($75)

Outdoor Research Echo Hoodie (women's baselayers)Category: Lightweight
Materials: 100% polyester
Weight: Unavailable
What we like: Great versatility for mild weather and intense activity.
What we don’t: Merino is much softer and more odor-resistant; all-polyester design is prone to pills and snags.

It’s hard to beat Smartwool’s Intraknit Thermal above for high-output activities in cool to cold weather, but we turn to Outdoor Research’s thinner Echo Hoodie for shoulder-season and even summertime use. The popular collection features free-flowing polyester in several different styles including a tank, short-sleeve shirt, and crew and quarter-zip tops (among others), with the Hoodie being a staff favorite. In our opinion, the biggest draw is versatility: Wear the Echo as a breathable baselayer on a high-output spring ski tour, as a winter running shirt, or as a sun hoody for bluebird days on the rock. We also really like the hood, which extends the Echo’s warmth, coverage, and sun protection above the neck.

The Echo is highly breathable and wicks moisture significantly better than merino alternatives, but it’s not without fault. First and foremost, we’ve found the fabric prone to pills and snags, and it lacks the soft next-to-skin feel of merino offerings like the Ridge Merino Aspect and Smartwool Classic All-Season above. Additionally, while we appreciate that OR incorporated their ActiveFresh Odor Control, the Echo is known to hold onto stink. Finally, the Echo has a lower UPF rating than most sun shirts (15 to 20 depending on colorway). These complaints aside, the Echo manages moisture better than most, making it one of our favorite baselayers for mild conditions or high-output use in any season. If you’re hard on your gear and wary of spending $75 on a product that may only last a season or two, it might be worth considering a synthetic option like Patagonia’s Long-Sleeved Capilene Cool Daily ($55), which is a thinner variation of their Capilene Midweight above.
See the Outdoor Research Echo Hoodie


11. Kari Traa Rose Half-Zip ($120)

Kari Traa Rose Half-Zip women's baselayerCategory: Heavyweight
Material: 100% merino wool
Weight: 240g/m² 
What we like: Supremely soft and warm with fun styling.
What we don’t: Too thick for shoulder-season use.

Norwegian brand Kari Traa bucks the shrink-it-and-pink-it trend with a lineup of high-performance outerwear designed for women, by women. You won’t find boxy or bland baselayers here—Kari Traa, the Olympic freestyle skier who founded her namesake company, places a high priority on fun color schemes and flattering shapes. In short, the brand represents the intersection of technical performance and feminine styling that the market has long needed. The Rose Half-Zip is one of their most popular offerings and rife with thoughtful features and details, including a form-fitting design, tall collar with a ventilating front zip and chin guard, high-quality cuffs, and flat seams. And the styling is hard to beat: The vibrant snowflake pattern and contrasting underarm panels give the piece a decidedly modern and elegant look with a healthy selection of colorways to boot.

Like the Smartwool Classic Thermal above, the Kari Traa Rose is made with 100% merino wool, which translates to excellent temperature regulation, odor control, and next-to-skin comfort. But despite Kari Traa's "midweight" designation, the Rose is a good deal thicker and warmer than the Smartwool, and the fit is noticeably snugger (you may want to size up depending on your intended use). In the end, we love this layer for resort skiing and snowboarding, but it's overkill for mild conditions or active use. For a step down in warmth, check out their Edith and Else tops, which feature 220 and 210-gram fabrics, respectively (the Rose is 240g).
See the Kari Traa Rose Half-Zip


12. Helly Hansen Lifa Stripe Crew ($45)

Helly Hansen Lifa Stripe Crew (women's baselayer)Category: Lightweight
Material: 100% polypropylene
Weight: 125g/m²
What we like: A comfy, stylish, and performance-ready baselayer for under $50.
What we don’t: Limited warmth and tight fit.

Helly Hansen’s Lifa Stripe Crew goes head-to-head with the REI above as a well-rounded budget option. The lightweight build is a step down in warmth and thickness from the midweight REI, but it will still keep you dry and decently cozy in most conditions. The headliner is the Lifa fabric, which is made from polypropylene and specializes in wicking moisture away from the skin (in our experience, it performs better than polyester). Tack on a snug, athletic fit, and the Lifa Stripe is a great next-to-skin layer for high-output activities like backcountry skiing and hiking. At just $45 and a scant 5.3 ounces, Helly Hansen managed to pack in an impressive amount of performance at a very low cost and weight.

What gives the REI Midweight the edge over the Helly Hansen Lifa Stripe in our rankings? The biggest factor is warmth: The polypro build isn’t as warm as polyester, meaning you'll want to pair it with a solid midlayer or insulated shell in cold conditions. What's more, the Helly Hansen can't match merino wool when it comes to next-to-skin feel, and the extra-tight fit will be polarizing for some. The Lifa may be worth the trade-offs for high-output use, but if you value warmth over breathability, we think it’s worth opting for one of REI’s budget-oriented polyester options (including the $55 Midweight above or the $40 Lightweight Crew). Alternatively, Helly Hansen offers the midweight Lifa Merino Crew ($100), which features a merino wool exterior and polypropylene lining.
See the Helly Hansen Lifa Stripe Crew


13. Arc’teryx Rho Crew Neck LS ($100)

Arc'teryx Rho Crew Neck LS women's baselayerCategory: Midweight
Materials: 84% polyester, 16% elastane
Weight: 190g/m²
What we like: A great-looking synthetic baselayer for high-output activities.
What we don’t: Expensive; too warm for shoulder-season use.

Arc’teryx places a premium on high performance, which shows in their baselayer collection. Their Rho Crew Neck Long Sleeve is tailor-made for regulating body temperature in cold weather, whether you’re moving or standing still. The key here is Arc’teryx’s 190-gram Torrent material, which is a step up from most polyester/elastane blends: It doesn’t stretch out of shape or retain odor, is perfectly supple and stretchy, and features a cozy brushed liner for excellent comfort and moisture management. What’s more, the fit is particularly flattering (not too tight, not too loose, and just the right amount of tapering), while the slight V shape in the neckline adds a nice dose of flair—more than once, we’ve received compliments when wearing this shirt out casually. 

Arc’teryx recommends the Rho Crew Neck for low-output activities in cool temperatures, but we’ve found it to be a surprisingly good breather for its warmth and weight. In fact, it was one of our go-to baselayers last winter for outdoor training, including road running and Nordic skiing (we usually paired it with a lightweight softshell or windbreaker). But it’s not the best shoulder-season piece: As temperatures rose above freezing, we started to reach for thinner alternatives. As with most Arc’teryx products, the Rho Crew Neck doesn’t come cheap—$100 is a high price to pay for a synthetic baselayer—but it pulls off a non-merino build better than most. For those who prefer wool, we're also big fans of the Rho Merino Wool Crew Neck LS ($120), which features a warm dose of 240-gram merino (95% wool, 5% elastane).
See the Arc'teryx Rho Crew Neck LS


14. Patagonia Long-Sleeved Capilene Thermal Crew ($119)

Patagonia Long-Sleeved Capilene Thermal Crew women's baselayerCategory: Lightweight
Materials: 92% polyester, 8% spandex jersey
Weight: 129g/m²
What we like: Light but cozy with a nice dose of style.
What we don’t: Pricier than most synthetic competitors and not particularly performance-oriented.

Joining Patagonia’s Capilene Midweight Crew above is another option in the popular collection: the Long-Sleeved Capilene Thermal Crew. Right away, we’ll point out that the “thermal” designation is a bit of a misnomer: The synthetic build is super lightweight (right behind the TNF Summit Pro above) and noticeably more breathable than most merino alternatives. For reference, we wore a slightly pared-down version of the Capilene Thermal on a one-day ascent of Washington’s Mount Stuart last June and managed to stay cozy throughout the entire push. And comfort is a real selling point: The Polartec Power Grid fabric’s open-grid weave has a really supple and soft next-to-skin feel.

All that said, the Capilene Thermal Crew lags behind many synthetic competitors in long-term durability. Most notably, we experienced considerable pilling around the cuffs, which is largely cosmetic but nevertheless worth considering given the steep price tag. On the bright side, the fabric is good at resisting tears and holes, and the offset shoulder seams help minimize wear and chafing underneath pack straps. We also love the accommodating fit and pass-through front pocket, which add a nice dose of style for casual and around-town use. It’s true that the Capilene Thermal is the priciest synthetic design on our list and less performance-ready than many of the picks above, but the combination of comfort, breathability, and everyday-friendly looks is enough to earn it a spot.
See the Long-Sleeved Capilene Thermal Crew


15. Arc’teryx Hallam Merino Wool Hoody ($220)

Arc'teryx Hallam Merino Wool women's baselayerCategory: Midweight
Materials: 80% merino wool, 20% polyester
Weight: Unavailable
What we like: Premium warmth, good stretch and breathability, and versatile styling for both outdoor and everyday use.
What we don’t: The most expensive baselayer here; gridded exterior is susceptible to wind and snags.
Arc’teryx’s Rho Crew Neck LS above is a standout synthetic baselayer, but for added warmth and odor resistance, we turn to their Hallam Merino Wool Hoody. While more than double the price of the Rho, the wool-heavy Hallam has a whole lot going for it: On a recent testing trip in Chilean Patagonia, we came away impressed by the layer’s cozy and noticeably stretchy feel, along with the flattering fit that’s trim but not restrictive. Arc’teryx also nailed the smaller details, including a snug-fitting hood that easily slides under a helmet and asymmetrical cuffs that offer additional coverage at the back of the hands. And while largely subjective, we can’t help but love the Hallam’s versatile and attractive styling, which transitions seamlessly between outdoor and everyday use.
As we touched on above, the Arc’teryx Hallam doesn’t come cheap at $220, making it the priciest option on our list by a wide margin. We also have concerns about the gridded exterior, which is great for breathability but noticeably lacking in wind and abrasion resistance. To be fair, our hoody is looking pretty much like new after two full weeks of testing, but you’ll need to be careful to avoid snags and tears over the long term. But we keep coming back to versatility: The Hallam’s merino wool/polyester blend offers a hard-to-beat combination of odor resistance and breathability, and it’s one of our favorite baselayers to wear from the slopes directly to après activities. It's also available in a crew-neck version without the hood for $40 less, although we love the extra dose of warmth that the hoody provides.
See the Arc'teryx Hallam Merino Wool Hoody


16. Icebreaker 200 ZoneKnit Crew ($150)

Icebreaker 200 ZoneKnit Crew (women's baselayer)Category: Midweight
Material: 100% merino wool
Weight: 200g/m²
What we like: Competitive mix of warmth and breathability for working hard in cold weather.
What we don’t: $20 pricier than the Smartwool Intraknit above without enough to show for it.

If Smartwool’s Intraknit Thermal above caught your eye, it’s also worth considering Icebreaker’s similarly intentioned 200 ZoneKnit Crew. Like the Smartwool, the Icebreaker is a midweight design intended for working hard in cold weather, but trades the Intraknit’s partial-wool build for 100% merino. This translates to a boost in comfort, warmth, and odor resistance, making the ZoneKnit a great choice for high-output days in the cold. And Icebreaker didn’t skimp on the smaller details, including gusseted underarms for maximizing mobility, flatlock seams to minimize chafing underneath pack straps, thumb loops (which the Smartwool lacks) for smooth layering, and a drop tail hem that adds coverage when sitting down or bending over.

Why do we rank the Smartwool Intraknit above the Icebreaker ZoneKnit? While the all-merino build is great for next-to-skin comfort and stink prevention, it’s a step down from the Smartwool’s merino/polyester/elastane blend in terms of moisture wicking and durability. We generally prefer synthetic baselayers for sweat-inducing activities like nordic skiing and winter running (the Smartwool is a key exception); despite its active intentions, the Icebreaker will likely cause you to overheat. And although subjective, we’re not big fans of the ZoneKnit’s styling: The Icebreaker logo is positioned front and center, the stripes down the sides of each arm give the design a fairly technical look, and there’s an awkward seam running across the middle of the torso. A final clincher is the $20 increase in price over the Smartwool. But if you can score the ZoneKnit at a discount or simply prefer the all-merino construction, it’s another capable option for high-output use in the winter months.
See the Icebreaker 200 ZoneKnit Crew


17. Black Diamond Solution 150 Merino Crew ($135)

Black Diamond Solution 150 Merino Crew baselayerCategory: Light/midweight
Materials: 78% merino, 22% polyester
Weight: 150g/m² 
What we like: Innovative construction combines the performance benefits of merino and synthetic.
What we don’t: Expensive.

Black Diamond’s Solution 150 Merino Crew might look relatively unassuming on the outside, but there’s a lot more to this piece than meets the eye. The Solution’s calling card is its innovative NuYarn construction: Many manufacturers weave synthetic fibers together with merino to reap the benefits of both materials, but NuYarn takes it to the next level, wrapping nylon with extra-fine merino fibers in a thread that exudes technical performance down to its literal core. The net result is better durability and tear resistance compared to full merino designs like the Icebreaker 200 Oasis above, and the Solution also dries out very quickly when wet (great news for women who are prone to working up a sweat). All told, it’s a highly effective mix that merges the best properties of both fabrics.

After wearing the Solution 150 for six days straight while hiking in Patagonia, we were impressed with how well it held its shape and resisted odor. Under a loaded backpack, the offset shoulder stitching was comfortable and mitigated pressure points, and the thumb loops are sleek and well constructed. The BD also has a more relaxed fit than super-snug offerings like the Smartwool Intraknit Thermal and Icebreaker Oasis above, which many women will prefer. In fact, our only real gripe with the Solution 150 is its $135 price tag, which is $5 more than the Intraknit and $45 more than Smartwool’s comparable Classic All-Season above. But cost aside, the Solution offers solid all-around performance and will last longer than most all-merino baselayers without any major compromise in comfort, which is no easy feat. 
See the Black Diamond Solution 150


18. Ortovox 185 Rock'N'Wool Long Sleeve ($110)

Ortovox 185 Merino Rock'n'wool Long-Sleeve women's baselayerCategory: Midweight
Material: 100% merino wool
Weight: 185g/m² 
What we like: Proven merino performance, fun styling, and nice sustainability slant.
What we don’t: A little pricey and we have concerns about long-term durability.

Quality wool baselayers are a dime a dozen in 2024, but Ortovox’s 185 Rock'N'Wool Long Sleeve stands out for a few reasons. First, the Ortovox Wool Promise ensures that their products come from ethical and certified sheep farms. And second, we just can’t get enough of the styling on the Rock’N’Wool—if you want a merino baselayer with some flair, the multi-colored designs really pop in the conservative and largely bland baselayer market. And like the chart-topping Smartwool, the Rock’N’Wool is made with 100% merino, which means you get uncompromised odor resistance, great temperature regulation, and a cozy, soft touch. For a versatile and breathable next-to-skin layer that can take you straight from skin track to après, the Ortovox 185 is an eye-catching but still very capable choice.

At 185g/m², the Rock'N'Wool Long Sleeve is lighter than our top-ranked Smartwool Classic Thermal, meaning it’s more suitable for shoulder-season and high-output activities. That said, the thin fabric, paired with the fact that it’s not blended with a synthetic material, does make us concerned about the Ortovox’s long-term durability (even Smartwool’s 150g All-Season features a merino/nylon blend). Ortovox does offer their 230 Competition Long Sleeve, which is a step up in warmth with 240g/m² wool (the product name is a little misleading) and adds polyamide (41%) and elastane (2%) for a considerable boost in tear resistance. Another in-house alternative is the 120 Comp Light Long-Sleeve, a seamless, high-performance design that's great for high-octane efforts. All are excellent performance pieces, and a final decision will come down to how you prioritize warmth, breathability, and durability.
See the Ortovox Rock'N'Wool Long Sleeve


19. REI Co-op Merino 185 Long-Sleeve Half-Zip ($90)

REI Co-op Merino 185 Long-Sleeve Half-Zip women's baselayerCategory: Midweight
Material: 100% merino wool
Weight: 185g/m² 
What we like: Functional warmth and flattering cut.
What we don’t: Expensive for an REI product.

REI’s Midweight above is our favorite budget design this year, but the polyester construction falls short in terms of softness and odor-fighting ability. Enter their Merino 185 Long-Sleeve Half-Zip, which swaps in a full merino build that’s soft, has a good amount of stretch, and wicks moisture effectively. In terms of warmth, the 185-gram REI beats out thinner options like the Smartwool Classic All-Season above (150 g/²); we’ve found the midweight design to offer a really versatile level of warmth whether you’re backpacking or cross-country skiing. Finally, the fit is spot-on for many women with enough room to move around and modest tapering at the waist to add shape. In our experience, many REI products fit on the boxy and baggy side, but that’s not the case with the Merino 185 Half-Zip.

However, while the Merino 185 Half-Zip doesn’t suffer from the typical fit issues we anticipated, it does cost more than expected for an REI product. For reference, Icebreaker’s popular 200 Oasis Crew above is a noticeable step up in warmth for only $15 more, although you do get a front zip and higher collar on the REI. And for $10 less, Ridge Merino’s Aspect offers competitive warmth (180g/m²) alongside a great fit and finish. It’s worth mentioning that the REI Merino 185 features 100% merino, which gives up a little abrasion resistance (especially with the thin build) but results in an extra-soft feel. But in the end, the REI doesn’t quite stand out from a value perspective, which is why we rank it here.
See the REI Co-op Merino 185 Half-Zip

Women’s Baselayer Comparison Table

Baselayer Price Category Materials G/M² Weight
Smartwool Classic Thermal 1/4 Zip $120 Mid/heavyweight 100% merino wool 250 8.3 oz.
Patagonia Capilene Midweight Crew $79 Midweight 100% polyester 147 5.4 oz.
REI Co-op Midweight Long-Sleeve $55 Midweight 92% polyester, 8% spandex Unavail. Unavail.
Smartwool Intraknit Thermal Crew $130 Midweight 53% merino, 45% polyester, 2% elastane 200 6.4 oz.
NW Alpine Black Spider Hoody $135 Midweight 93% polyester, 7% spandex 197 10 oz.
Ridge Merino Aspect High Neck $80 Midweight 84% merino, 16% nylon 180 6.6 oz.
The North Face Summit Pro 120 $100 Light/midweight 100% polyester 120 4.6 oz.
Icebreaker 200 Oasis Crew $105 Miweight 100% merino wool 200 6.5 oz.
Smartwool Classic All-Season $90 Light/midweight 88% merino wool, 12% nylon 150 4.7 oz.
Outdoor Research Echo Hoodie $75 Lightweight 100% polyester Unavail. 3.9 oz.
Kari Traa Rose Half-Zip $120 Heavyweight 100% merino wool 240 7.6 oz.
Helly Hansen Lifa Stripe Crew $45 Lightweight 100% polypropylene 125 5.3 oz.
Arc’teryx Rho Crew Neck LS $100 Midweight 84% polyester, 16% elastane 190 5.6 oz.
Patagonia Capilene Thermal Crew $119 Lightweight 92% polyester, 8% spandex 129 6 oz.
Arc'teryx Hallam Wool Hoody $220 Midweight 80% merino, 20% polyester Unavail. 12.3 oz.
Icebreaker 200 ZoneKnit Crew $150 Midweight 100% merino 200 7.4 oz.
Black Diamond Solution 150 $135 Light/midweight 78% merino, 22% polyester 150 5.2 oz.
Ortovox 185 Rock'N'Wool LS $110 Midweight 100% merino wool 185 5.7 oz.
REI Merino 185 Half-Zip $90 Midweight 100% merino wool 185 Unavail.

About Our Testing Process

Baselayers are a key part of the layering equation, whether you’re hiking deep into the backcountry or earning a few turns before work. To supplement our unisex baselayers round-up, which covers both men’s and women’s designs, managing editor Sarah Nelson put together our initial list of 16 women’s-specific picks in 2022. An avid climber, hiker, backpacker, and downhill skier, Sarah has used and abused dozens of baselayers over the years, from lightweight and breathable synthetics for high-output use to thick wool designs for cold-weather pursuits. Former senior editor Jenny Abegg also contributed extensively to this guide, drawing from her expertise as a mountain runner and insatiable backcountry enthusiast.
Our list of 19 picks above reflects our experiences from ongoing testing, along with feedback from our female contributors and the wider hiking and skiing communities. When we test baselayers, we pay close attention to characteristics like warmth, breathability, comfort, and fit. We also take note of how long each baselayer fends off stink between washes, as well as how it holds up over time—pilling, tears, and snags are all signs we look for when evaluating long-term durability. Finally, we know that the women’s baselayer market is constantly changing and evolving. As a result, we continue to test new designs as they hit the market, adding any standouts (and removing any that fall short) to the list above.

Women's baselayer (arms outstreched in Smartwool Intraknit Thermal)
Testing the women's Smartwool Intraknit Thermal while skiing in Oregon | Credit: Jon Tapper

Women’s Baselayer Buying Advice

Baselayer Warmth Categories

When searching for the right baselayer, one of the most important considerations is warmth. Do you need thin and breathable insulation for shoulder season running, or a cozy and thick long-sleeve for deep-winter resort skiing? To help with your search, we've broken down our picks into three categories—lightweight, midweight, and heavyweight. In assigning these categories, we take into account the baselayers' materials and fabric weight, in addition to our own testing experience. 

Logically, lightweight baselayers are the best breathers but do the least toward keeping you warm, making them ideal for spring skiing, bluebird days, and high-output activities such as nordic skiing and cold-weather running. That said, even thin merino wool baselayers can be very warm for their weight, so you’ll want to keep this in mind depending on your use (we found the 180-g Ridge Merino Aspect to be much too warm for ski touring). What’s more, the thinner the merino, the less durable it becomes; for this reason, most lightweight baselayers are made of polyester. One of our favorite lightweight offerings is the Outdoor Research Echo Hoodie, which we’ll even wear as a sun protection shirt during the summer months. If you’re looking for mid-winter warmth, it’s worth bumping up to a midweight baselayer.

Women's baselayer (backpacking in mountains)
Lightweight baselayers work well for shoulder-season hiking and backpacking | Credit: Brian McCurdy

For the widest variety of conditions, a midweight baselayer makes the most sense. It will provide the warmth you need yet still breathe well enough for physical exertion, especially when made with high-quality merino or polyester. Midweight baselayers are the most popular choice for downhill skiers: They’re plenty warm for the lift ride up but won’t cause you to overheat on the descent. They are less popular than lightweight baselayers for hiking or ski touring in moderate conditions, as the extra warmth corresponds with a drop in the fabric’s ability to regulate temperatures (even midweight merino can get too hot in warm temperatures). But in cool spring and fall conditions, a midweight baselayer can perform great as an outer layer and is the ideal next-to-skin piece for resort skiing on cold days.

Women's baselayer (stuffing jacket into backpack)
Midweight baselayers are the most versatile option for all seasons | Credit: Brian McCurdy

Heavyweight baselayers are purpose-built for use in cold temperatures or if you’ll be relatively sedentary. The extra thickness inhibits breathability, and it’s easy to work up a sweat even on short walks. Keep in mind that you don’t need all of your insulation from a single article of clothing, and as a result, you can always add warmer layers on top of a light or midweight baselayer. But for deep-winter resort skiing, extreme cold, or low-output activities around camp, a heavyweight baselayer can be the height of coziness. If you do go this route, we love designs like the Smartwool Classic Thermal and Kari Traa Rose Half-Zip.

Women's baselayer (Patagonia Capilene Thermal Weight at resort)
Patagonia's Capilene Thermal Weight is overkill for active use and mild conditions | Credit: Jason Hummel

Baselayer Materials

Merino Wool
Merino wool is our favorite baselayer material for winter use: In addition to being incredibly soft and warm for the weight, it offers great temperature regulation and resists odor much better than synthetic fabrics. That said, merino wool falls short of the synthetic competition when it comes to durability, especially thin varieties and those that aren’t blended with other materials like polyester or nylon (for example, the Smartwool Classic All-Season is 88% merino wool and 12% nylon). Many merino baselayers are also too warm for mild conditions or heart-pumping activities like backcountry touring, running, or Nordic skiing, and they absorb sweat more readily than synthetics (which isn’t great news once you cool down). But for mellow days out or if you simply prefer the feel of natural material, merino has a lot to offer. For more information about its pros and cons, check out our article: Merino Wool: Is It Worth It?

Women's baselayer (adding ski shell overtop)
Merino wool baselayers are soft, odor-resistant, and do a great job at regulating temperature | Credit: Brian McCurdy

Synthetic materials like nylon and polyester are a cost-effective alternative to merino, and excel in terms of moisture wicking and durability. For shoulder-season conditions, high-output activities, or use as an outer layer (as in the case of a layer like the NW Alpine Spider Hoody), they’re our first choice. The largest downside to synthetics is stink build-up; despite efforts from manufacturers, odor-resistant polyesters and nylons still can’t compete with the natural benefits of merino (although they are improving). In addition, synthetics don’t provide as much warmth for the weight, and as such are not our first choice in truly frigid conditions or for low-intensity activity. It’s also worth noting that they range a great deal in terms of quality: The Arc’teryx Rho Crew Neck LS uses a really high-end polyester material, while the Patagonia Capilene series is more prone to pilling and snagging.

It’s not quite as simple as deciding between an all-merino or all-synthetic baselayer. Some brands use blends that aim to offer the comfort and performance of merino wool alongside the durability and moisture-wicking of polyester/nylon. We often see this in lightweight varieties: NuYarn (as seen in the Black Diamond Solution 150) wraps merino fibers around a nylon core, and then weaves this manufactured thread together with polyester. It’s worth being cautious with 100% merino—unless the fabric weight is around 200 grams per square meter (or more), pure merino wool will form holes fairly quickly.

Women's baselayer (hiking in Arc'teryx Hallam Merino Wool Hoody)
Arc'teryx's Hallam Merino Wool Hoody uses a functional mix of merino and polyester | Credit: Jason Hummel

Fabric Weight (g/m²)

Manufacturers list the weight of a baselayer's fabric in terms of grams per square meter (g/m², or GSM), which provides a good idea of how much warmth the baselayer will provide. From our picks above, these weights range from 120 grams per square meter for the The North Face Summit Pro 120 to 250 grams per square meter for the Smartwool Classic Thermal 1/4 Zip (keep in mind that not every manufacturer reports this spec). On the low end, the Summit Pro is a great pairing for mild conditions and high-output activities, while offerings like the Classic Thermal will be overkill for everything but deep winter. It's important to note that fabric weight does not always perfectly align with warmth, due to variations in fit and material (1-g merino wool generally offers more warmth than 1-g polyester). For example, we've found the 240-gram Kari Traa Rose to be much warmer than the 250-gram Smartwool Classic Thermal.

Women's baselayer (putting on ski jacket)
Fabric weight is a key determinant of how much warmth a baselayer will provide | Credit: Brian McCurdy


The breathability of a baselayer is dependent on a number of factors, including the type and quality of the fabric, thickness, and openness of the weave. In general, lightweight merino wool and synthetic baselayers (like the Outdoor Research Echo) offer better breathability than heavier-weight offerings. But between the two materials, synthetics are by far the more breathable choice: While merino does a great job pulling moisture away from your skin, it has a tendency to hold on to it. We’ve also found that merino is simply too warm for most intense activities. As a result, synthetic baselayers are our go-to for mild conditions or when we anticipate building a sweat (think ski touring, nordic skiing, and running). And it’s worth mentioning that there are a few merino offerings that we’ve found to be serviceable, particularly those with mesh panels in high-heat areas (like the Smartwool Intraknit Active or Icebreaker 125 ZoneKnit). 

Polyester: Excellent
Blends: Very good
Merino: Good

Women's baselayer (bootpacking in Smartwool Intraknit Thermal
Smartwool's Intraknit Thermal is a great option for high-output use in cool to cold weather | Credit: Jon Tapper

Odor Prevention

Merino wool excels at pulling moisture away from your skin, and less sweat buildup means less stink. If you’re taking an extended backcountry trip and don’t want to carry multiple baselayers or rinse them each night, merino is the way to go. Some synthetics do fine at fending off odor, provided you aren’t working up a huge sweat. For example, we’ve hiked for extended periods in Patagonia’s Capilene Midweight in cool weather and have been impressed with its odor resistance. But nothing beats merino in keeping you dry and stink-free.

Merino: Very good
Blends: Good
Synthetics: Not good

Women's baselayer (backpacking in Patagonia in merino baselayer)
Wool baselayers naturally resist odors, which is great for multi-day outings into the backcountry | Credit: Brian McCurdy


Here is where the tide changes: Merino is super soft but prone to developing small holes over time that eventually hamper the performance of the product, whereas synthetics should last for multiple seasons. To put this in perspective, we usually get a season or two out of a standard lightweight merino baselayer, even from the top brands and by following their washing instructions (cold water and line dry). Admittedly, these shirts get a lot of use, but that’s still a very short lifespan. But with synthetics, one or two seasons would be on the short end of the spectrum, and we would hope for three or four.

Some companies are blending wool and synthetics to increase the strength of the baselayer without compromising next-to-skin comfort, and overall results have been positive. We haven’t noticed much of a drop in terms of comfort or performance, but merino/synthetic blends are a step up in durability. Even so, if we’re wearing a baselayer without anything overtop, we’ll always opt for a fully synthetic piece such as the NW Alpine Black Spider Hoody.

Synthetics: Excellent
Blends: Very good
Merino: Not good

Women's baselayer (climbing in the NW Alpine Black Spider Hoody)
Climbing in the ultra-durable NW Alpine Black Spider Hoody | Credit: Jenny Abegg

Crew Neck vs. Quarter or Half Zips

Nearly every baselayer on the market is offered in several styles, including long-sleeve crew and half/quarter-length zippered shirts. Many women opt for a crewneck style to minimize bulk, but there are several reasons to consider a zippered shirt. One upside is the ability to adapt to changing weather conditions: You can zip up for added warmth at the start of the day and unzip as you work up a sweat. And if you want to remove the shirt altogether, it’s nice not having to take off your helmet to do so. Additionally, the extra coverage you get with the raised collar is a nice boost in warmth, and we’ve even found that many quarter- or half-zip long sleeves wear decently well around town too. The downside is that the collar can flop around if you unzip the shirt while running, and having a zipper on your next-to-skin layer isn’t as comfortable as the cleaner crew style (especially when adding multiple layers overtop).

Softshell jacket (Arc'teryx Gamma MX Hoody skinning)
Half- and quarter-length zippers allow you to dump heat quickly | Credit: Brian McCurdy

Baselayer Fit

For optimal performance, baselayers need to have a snug fit. This helps the fabrics draw moisture away from your skin most efficiently. Some women like wearing their baselayers for casual use, and that’s when dedicated performance designs like the Smartwool Intraknit Thermal and Icebreaker Oasis 200 are less useful. These shirts conform to your body like performance pieces should but are far too tight to wear anywhere else. REI’s Merino 185 Long-Sleeve Half-Zip and Patagonia’s Capilene Thermal Crew are on the opposite end of the spectrum, with roomier fits (especially around the torso) that sacrifice a little in moisture wicking and breathability but have added casual appeal. In the end, your decision is a personal one, and we recommend looking at fit based on intended use and preferences on style.

Women's baselayer (closeup of Kari Traa Rose Half-Zip)
Most baselayers are fairly snug for ideal layering | Credit: Jason Hummel

Key Baselayer Features

Baselayers can range from simple, featureless crew tops like the Patagonia Capilene Midweight Crew to hooded half-zips with a chest pocket (the NW Alpine Black Spider Hoody, for example). If you know you’ll be layering a mid or outer layer over your baselayer, the simpler the better. However, those who wear their baselayer as an outer layer will appreciate zip pockets and thumb loops. And climbers and skiers will benefit from a tight hood or balaclava that fits under their helmet (like what you get with the Arc’teryx Hallam Merino Wool Hoody). Some baselayers even have the capability of blocking sun rays (measured by the UPF rating). As usual, it will help to identify what you’ll be using your baselayer for before determining what features you need.

Women's baselayer (layering shell over Arc'teryx Rho LT Zip Neck)
Arc'teryx's Rho Zip Neck sports a zippered pocket on the left arm | Credit: Brian McCurdy

Baselayer Care

Caring properly for your baselayers can go a long way toward maximizing their lifespan, especially if you opt for an all-merino design. As with most wool products, we recommend washing merino baselayers in cold water and line drying. Directions vary by manufacturer—some may claim that merino can be machine-dried, but we’ve found this can result in premature pilling and unwanted shrinkage. Another consideration is thickness: Thinner baselayers like the Smartwool Classic All-Season tend to break down quicker than thicker designs like their Classic Thermal, especially in high-wear areas like the cuffs and shoulders. Lastly, synthetics typically require less maintenance—just throw them in with your other laundry—but we’ve never felt overburdened by taking a little more care with our merino layers.

Women's baselayer (gearing up in Smartwool Intraknit Thermal)
Merino baselayers require a bit more care than synthetic alternatives | Credit: Jon Tapper


The focus on sustainability has been increasing in the outdoor industry over the past several years, and baselayers are no exception. In this category, there currently are two key trends: responsibly sourced wool and the use of recycled synthetic materials. The former indicates that sheep were treated humanely and in accordance with strict animal welfare and environmental standards (there are a number of certifications, including the Responsible Wool Standard and ZQ-certified wool). We’ve also begun to see more companies utilizing recycled materials, which cuts down on fossil fuel consumption and reduces the amount of plastics being produced overall (Patagonia's Capilene Midweight is made from 100% recycled polyester). All in all, we appreciate these efforts and are eager to see more brands come on board.

Backpacking in the Arc'teryx Rho Merino baselayer
The wool version of the Arc'teryx Rho Crew Neck uses RWS-certified merino | Credit: Brian McCurdy

Other Baselayers

Baselayer T-Shirts and Tank Tops
Our list above comprises long-sleeve baselayers, but many of the designs are also sold in T-shirt and/or tank top variations for warm-weather activities like backpacking and hiking. Apart from the inherent differences in warmth and coverage, T-shirts and tanks are generally cheaper since they utilize less material. For example, the Smartwool Classic All-Season Long-Sleeve costs $90, while the T-Shirt is $80.

In the end, a final decision will come down to preferences on warmth, coverage, and styling. The consensus among our female editorial staff is that short sleeves and tanks are the preferred option in the summer and shoulder seasons, especially for movement-dependent activities like running and climbing. If the temperature drops, you can simply add a light layer overtop. Long sleeves are a nice alternative for those who want added sun protection and coverage, but the boost in warmth can be a downside on truly hot and exposed days, even if you opt for a thinner design.

Women's baselayer (hiking in Patagonia)
Short sleeves are great for summer adventures and will save you some cash | Credit: Brian McCurdy

Baselayer Bottoms
Most baselayers on this list have matching bottoms with the same construction that are available at a similar or identical price point. For brevity’s sake, we list the tops here as they are more popular, but the bottoms are readily available and share the same pros and cons. However, generally speaking, maintaining a warm core will do much more for your entire body’s comfort than keeping your legs warm. But given that there’s no need to choose—and provided that almost nothing is cozier than a pair of long johns—we’re huge proponents of quality baselayer bottoms as well.

Women's baselayer (showing off baselayer bottoms under shell pants)
Many of the tops above have matching bottoms that offer similar performance | Credit: Brian McCurdy

Layering Systems: Base, Mid, and Outer Layers

To get the most out of your technical clothing, it’s important to think of everything as a system. Each piece relies on the layers around it to perform well. As an example, if you have a baselayer that wicks moisture well but are wearing a fully rubber mid or outer layer, it won’t matter how nice of a merino fabric you have: You’ll still be wet and miserable. As such, take the time to put together mid and outer layers that are as high-performing as the baselayers listed above.

Women's baselayer (underneath midlayer and shell)
While crucial, a quality baselayer is just one part of the layering equation | Credit: Jenny Abegg

Baselayers serve two primary purposes: To keep you warm and to wick moisture. Whether constructed with wool, synthetic material, or a blend, a baselayer is made to retain your body’s heat while moving moisture (i.e., sweat) away from the skin. And it’s important to note that these functions work together—keeping your body dry will in turn lead to more warmth. They can be worn underneath a midlayer or shell during the winter months or as an outer layer during the fall and spring for activities like hiking, biking, and climbing. The thickness and material of your baselayer will heavily impact warmth and breathability, so make sure to keep this in mind when making a purchase. If you’re still on the fence about which option is best for you, we’ve broken down all of the key considerations in our article: How to Choose Baselayers.

Women's baselayer (putting on ski boots in van)
As your next-to-skin layer, baselayers are tasked with trapping warmth and wicking moisture | Credit: Brian McCurdy

For high-output activities like hiking, backpacking and climbing, breathability is top priority. We recommend a fleece jacket or synthetic jacket for balancing warmth and ventilation. High performers include the Arc’teryx Atom and the R line of fleeces from Patagonia (including the R1 Air Zip-Neck). If you only plan to grab your insulating layer during downtimes, such as hanging around camp after the sun goes down, consider a warm and super packable down jacket. Skiing is a similar story, and conditions will dictate the best midlayer for you. Options can range from a puffy down jacket to a light fleece.

Women's baselayer (Patagonia Capilene Air underneath midlayer)
Synthetic jackets are a popular midlayer choice for high-output uses like ski touring | Credit: Brian McCurdy

Outer Layers
Outer layers are the most specialized part of the system, and their complex designs can get quite pricey. A waterproof, breathable, and packable rain jacket is needed for activities like climbing and hiking/backpacking. Winter conditions are much harsher, so durability takes precedence for ski jackets. These designs offer more pockets for storing gear or personal belongings and a longer fit to protect you from snow sneaking through. There are also hardshell jackets that blur the lines, mixing the weight of a rain jacket with the performance (and extra cost) of a ski jacket.
Back to Our Top Women's Baselayer Picks  Back to Our Baselayer Comparison Table

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