If you’re looking for a jacket that offers solid warmth at a good value, synthetic insulation is the way to go. You don’t get quite as high of a warmth-to-weight ratio as down, but synthetic jackets resist moisture, can breathe better, and are more cost-efficient. With the choice of both types in our gear closet, we find ourselves consistently reaching for our favorite synthetic jackets for just about everything but lightweight backcountry pursuits where every ounce counts. Below are our picks for the best synthetic jackets of 2021, from lightweight pieces designed for cool fall and spring weather to winter parkas that can handle the toughest four-season conditions. For more background, see our comparison table and buying advice below the picks.
Weight: 13.2 oz.
Insulation: Coreloft Compact (60g)
What we like: Great mix of warmth, mobility, and comfort.
What we don’t: Breathability could be better.
Arc’teryx makes some of the top jackets and shells on the market, and the Atom LT Hoody is perhaps their most well-known model. This synthetic jacket absolutely nails the essentials: you get impressive warmth for the weight, supreme comfort, a useful feature set, and a sleek design. Unlike the Patagonia Nano-Air below that has a softer shell and interior fabric, it’s tougher and shows less wear over time. And last fall, Arc’teryx updated the Atom LT with a more durable face fabric, a longer hem, and improved cuffs, making our favorite synthetic jacket even better.
We’ve worn the Atom LT during all kinds of outdoor activities from hiking and biking to cross-country skiing, so how does it compare? The Arc’teryx isn’t quite as breathable as the Patagonia Nano-Air below and other performance-centric synthetic jackets, but the Coreloft Compact insulation and stretchy fleece side panels still work well for active use. Most of all, we love the versatility: the Atom LT works great as an outer layer or midlayer, and it’s one of the best options on this list for everyday wear. For a similar jacket with more warmth, the Arc’teryx Atom AR uses thicker 120g Coreloft insulation around the core... Read in-depth review
See the Men's Arc'teryx Atom LT Hoody See the Women's Arc'teryx Atom LT Hoody
A Close Second (With Greater Breathability)
Weight: 12.2 oz.
Insulation: FullRange (60g)
What we like: Best-in-class comfort and breathability.
What we don’t: Not as durable as other jackets on this list.
The Nano-Air from Patagonia may not be our top overall pick, but it wins outright in one important category: comfort. This pillowy synthetic jacket is extremely soft, stretchy, and breathable—it feels like a combination of a high-end performance piece and your favorite sweatshirt. Climbers and active folks love its ability to move and breathe (the FullRange insulation and stretchy shell are noticeably more breathable than the Atom LT above), and you won’t find a cozier piece for daily use or travel.
We knock the Nano-Air down a notch because it isn’t quite as durable as we would like for the price. The super-soft fabrics that define the jacket and make it so comfortable have a tendency to show wear with heavy use, and particularly around the sleeves and back of the neck. That said, Patagonia upgraded the shell on the latest version to a stronger 33-denier nylon, so we're optimistic that it will hold up better over time. Additional changes included swapping the quilted side panels for a smoother look (a positive upgrade in our opinion), and Patagonia incorporated an 87-percent-recycled polyester shell and lining. But the formula largely remains the same, and the Nano-Air still is one of our favorite synthetic jackets... Read in-depth review
See the Men's Patagonia Nano-Air Hoody See the Women's Patagonia Nano-Air Hoody
Best Budget Synthetic Jacket
Weight: 1 lb. 8 oz.
Insulation: 100% Polyester
What we like: A solid value for a good-looking jacket.
What we don’t: Limited performance chops.
You can get as techy as you want with your synthetic jacket these days, but Stoic's Insulated Stretch is a quality budget offering. Priced at just under $100, you get simple polyester insulation along with a water-resistant shell fabric for good warmth and weather protection. In addition, we like the clean design and athletic fit of the Stoic, which make it a nice around-town piece that can pull double duty for winter sports. All in all, it’s a great value at less than half the price of the options above.
Keep in mind that the Stoic Insulated Stretch Insulated is not a performance piece and you get what you pay for in that regard. The basic insulation isn’t nearly as breathable as the active insulation models on this list, the jacket doesn’t stuff down as small as the down imitators and will take up considerable space in your pack, and it’s lacking features like a helmet-compatible hood. But dollar for dollar, the Stoic is a solid option for daily use, hiking in cool weather, and as a layering piece for downhill skiing.
See the Stoic Insulated Stretch
Best Imitation of a Down Jacket
Weight: 9.3 oz.
Insulation: PlumaFill (65g)
What we like: Warm, light, packable, and resistant to moisture.
What we don’t: Expensive for a synthetic jacket and has a thin shell.
Few synthetic jackets, if any, have received the hoopla of the Micro Puff from Patagonia. As has been attempted many times in the past, the jacket’s PlumaFill insulation tries its best to mimic the loftiness and warmth of down. Patagonia has done an excellent job here, and the Micro Puff lives up to its billing: it’s warm, light at just over 9 ounces, well-built, and comfortable. We also like that it packs down small for a synthetic, much like your favorite down jacket would.
Our issues with the Micro Puff are that it’s expensive and not super versatile. For $300, you could buy a premium down jacket like the Feathered Friends Eos that is similar in weight but warmer, although the Patagonia wins out in wet conditions (down will lose its loft and stop insulating). Additionally, the thin 10-denier shell fabric makes it one of the most fragile synthetic jackets on this list—we’ve put a number of holes in ours—and limits its everyday appeal (for a step up in durability, check out Patagonia’s DAS Light Hoody below). But we do love the warmth and packability of the Micro Puff, and it’s a fun lightweight piece for the right uses. And if you’re on the hunt for more insulation, Patagonia also makes the winter-ready Macro Puff (15.3 oz., $399)... Read in-depth review
See the Men's Patagonia Micro Puff See the Women's Patagonia Micro Puff
Best of the Rest
Weight: 14.7 oz.
Insulation: Coreloft Compact (60 and 80g)
What we like: For high-output activities, the Proton LT is significantly more breathable than the Atom LT.
What we don’t: Built for the cold and you can overheat in mild conditions.
One knock we have against our top-ranked Atom LT is breathability, which Arc’teryx’s more performance-oriented Proton line seeks to remedy. The Proton LT is a superb active insulation jacket, with 80-gram Coreloft Compact in the body and 60-gram in the hood (Coreloft Compact is more breathable and packable than the regular version used in the Atom). As expected from Arc’teryx, you also get a premium finish and fit, excellent mobility, and a stretchy face fabric that is both comfortable and durable. In practice, this jacket is a great match for high-output use in cold conditions and has become our go-to midlayer for backcountry skiing and other winter adventuring.
Why isn’t the Arc’teryx Proton LT ranked higher? At the end of the day, it’s a targeted piece that is most at home in the cold. If you’re really working hard in conditions above freezing, the Proton simply can be too much jacket and we’ve had a tendency to overheat and start sweating (when sedentary like sitting around camp, it can be good up to about 60 degrees Fahrenheit). It is worth noting that Arc’teryx makes an even lighter Proton FL Hoody with Octa Loft insulation, which still is highly breathable but less warm and weather-resistant. Both Proton models are excellent synthetic jackets for performance use but lack the everyday appeal of the Atom line... Read in-depth review
See the Men's Arc'teryx Proton LT See the Women's Arc'teryx Proton LT
Weight: 11.9 oz.
Insulation: PrimaLoft Gold Eco (60g)
What we like: Lightweight feel and a great synthetic jacket for casual use.
What we don’t: Will have trouble withstanding serious cold or wet.
Before the Nano-Air there was the Nano Puff. This versatile synthetic jacket is a nice choice for around-town use, walking and hiking on crisp days, and even as a midlayer for resort skiing. Similar to The North Face ThermoBall below, it feels somewhat similar to a lightweight down jacket but with better wet-weather performance and a lower price. This combination has made it one of Patagonia’s best-selling jackets year after year.
For those deciding between the trio of Patagonia synthetic jackets included near the top of this list, here is what you need to know. The Nano Puff is the most casual of the group, has a shell that is more slick than soft, and its lightweight and comfortable feel have made it popular for daily use, travel, and light adventuring. The Nano-Air is softer to the touch and more breathable, making it the performance pick of the group and a great option for active use. And the Micro Puff is very close to a lightweight down jacket in terms of warmth and breathability, but it’s much more fragile and expensive than the Nano Puff... Read in-depth review
See the Men's Patagonia Nano Puff See the Women's Patagonia Nano Puff
Weight: 15.2 oz.
Insulation: PrimaLoft ThermoBall Eco
What we like: The puffy feel of a down jacket.
What we don’t: Heavier than the Patagonia Nano Puff above.
Synthetic-insulated jackets long have aspired to mimic down, and the popular ThermoBall from The North Face is one of the best efforts yet. Created in partnership with insulation wizards PrimaLoft, ThermoBall technology is an efficient insulator thanks to small round clusters of PrimaLoft thermal fibers housed inside its brick-like baffles. This gives the jacket a look and feel that emulates a lightweight puffy but at a lower cost and with superior performance when wet.
The North Face recently updated the ThermoBall to the “Eco,” which included swapping the standard nylon shell and polyester fill for 100-percent recycled materials. Further, the fit of our medium-size jacket is noticeably slimmer than the prior version, which is a good thing. Unfortunately, weight has stayed about the same at a listed 15.2 ounces (our men’s medium was a bit lighter at 14.1), so it still falls well short of the 11.9-ounce Patagonia Nano Puff above that delivers similar all-around performance. That said, the ThermoBall’s smooth styling makes it a strong option for daily wear, and it’s both warm and comfortable as a midlayer while skiing... Read in-depth review
See the Men's The North Face ThermoBall See the Women's The North Face ThermoBall
Weight: 11.3 oz.
Insulation: PlumaFill (65g)
What we like: Class-leading warmth and weather resistance in a lightweight and packable build.
What we don’t: Expensive, not super breathable, and needs a hem adjustment.
Patagonia’s DAS Light Hoody is one of the most impressive new synthetic jackets we’ve tested of late, merging design features from two of our favorites for a best-of-both-worlds combination. You get the PlumaFill insulation of the Micro Puff above (billed as one of the loftiest and lightest fills on the market) alongside the Pertex Quantum Pro shell of the winter-ready DAS Parka below. The end result is a very capable jacket that can hold its own as a standalone piece in inclement weather while tipping the scales at just 11.3 ounces (and it still manages to include features like a helmet-compatible hood and two-way zipper, which the Micro Puff omits). For weight-conscious climbers and skiers who get out a lot in a range of conditions, it’s hard to beat.
It should come as no surprise that the DAS Light’s biggest competition comes from Arc’teryx in the form of their Nuclei FL below. For just a fraction of an ounce more, the Nuclei FL tacks on an adjustable hem and internal dump pockets, which are conspicuously omitted in the DAS Light’s design. But the Arc’teryx’s Arato shell is no match for the Patagonia’s Pertex Quantum Pro, which offers far more durability and protection than its 10-denier thickness would suggest (and a dramatic upgrade from the Micro Puff’s 10D nylon). We’ve tested this shell in a variety of conditions ranging from heavy rain to strong wind and have been blown away by its impermeable nature (which notably comes at the cost of some breathability). At $329, the DAS Light Hoody isn’t cheap, but the class-leading protection will be well worth the investment for many... Read in-depth review
See the Men's Patagonia DAS Light See the Women's Patagonia DAS Light
Weight: 1 lb. 0.7 oz.
Insulation: PrimaLoft Silver Active (60g)
What we like: Tough, stretchy, and breathable.
What we don’t: Heavier than the jackets above.
Black Diamond has been making a big push in jackets of late, and the results have been strong. We like their heavyweight Belay Parka for cold weather, but the First Light Stretch is a much more active synthetic that can be worn in a range of conditions as an outer layer or midlayer. To be sure, the designers have ski touring and climbing in mind—they call the First Light an ideal “start-stop” piece, and its build and feature set agree (and it's worth noting that BD also offers the First Light Hybrid, which has merino around back for even more breathability).
In the mold of Arc'teryx's Proton line, the First Light Stretch has a softshell-like outer that can take some use and abuse. Sacrifices come with a few ounces of added weight and PrimaLoft Silver Active instead of the more efficient Gold, but we like the added mobility and performance hood. For casual wear, we prefer the Atom LT or Nano-Air, but for serious skiers and climbers, the First Light Hoody is a top-notch synthetic jacket that is most at home in the backcountry... Read in-depth review
See the Men's BD First Light Stretch See the Women's BD First Light Stretch
Weight: 1 lb. 4.1 oz.
Insulation: VerticalX (60g)
What we like: Solid warmth, great fit, and clean looks.
What we don’t: Bulky and heavy—this is not your ideal backcountry piece.
For non-performance use, Outdoor Research replaced the old Cathode with the Refuge. We’ll start by saying that there is a lot to like about this jacket: it’s comfortable for around-town use with a pillow-y layer of VerticalX insulation. We really like the soft feel and clean styling, both of which are big improvements over the Cathode. The fit is just about perfect—it’s fairly athletic and not too baggy yet still allows for layering underneath. Last but not least, the Refuge offers a healthy amount of weather protection in terms of both wind and water.
Keep in mind that compared to many of the synthetic jackets above, the Outdoor Research Refuge is not made for the backcountry. It’s big, heavy at 1 pound 4.1 ounces, and doesn’t pack down very small (it could be used as a belay jacket, but other performance uses are limited). For testing purposes, we recently took the Refuge on a backpacking trip in Patagonia, and although it provided a nice barrier against the wind and added good warmth at camp, it took up such a large space in our pack that we wouldn’t do it again. But for casual use, walking the dog, and wearing around town, the Refuge is a winner and one of the warmer synthetics on this list... Read in-depth review
See the Men's Outdoor Research Refuge See the Women's Outdoor Research Refuge
Weight: 12.7 oz.
Insulation: Stratus (60g)
What we like: Solid warmth and wind protection for performance use.
What we don’t: The redesigned version has an inferior fit.
The Xenon from UK-based Rab is a synthetic jacket built for serious climbers and hikers. The Xenon replaced the much-loved Xenon “X,” and changes include Stratus insulation in place of PrimaLoft Gold Active, an Atmos ripstop shell instead of Pertex Quantum, and a lower weight. Similar to the older version, the Xenon packs down relatively small into its own chest pocket, which isn’t true of the popular Arc’teryx Atom LT above. Importantly, the jacket also saw a drop in price to under $200, which makes sense given the shift to in-house tech.
Why isn’t the Rab Xenon ranked higher? Our biggest complaint relates to fit. Whereas the previous version was slim and great for climbing and active use, the current model has a baggier cut and feels quite bulky. Given the performance nature of this jacket, that change doesn’t make a whole lot of sense. In addition, the everyday appeal of the Xenon isn’t on the same level as many the options above, plus it only comes in a hooded version, limiting its utility as a midlayer for activities like resort skiing. That said, it’s still a viable outer layer in summer and shoulder-season conditions and a solid option for fast-and-light alpinists... Read in-depth review
See the Men's Rab Xenon See the Women's Rab Xenon
Weight: 8.4 oz.
Insulation: Climashield Apex (65g)
What we like: Ultralight, warm, and reasonably priced.
What we don’t: Lack of storage, no cord adjustment in the waistband, and the jacket takes weeks to ship.
The majority of the jackets on this list aim to balance performance and casual use, but the Enlightened Equipment Torrid Apex is an outlier. Simply put, this is a true ultralight synthetic-insulated jacket built with serious thru-hikers in mind. It weighs just 8.4 ounces for the hooded version in a men’s medium, is filled with 65g Climashield Apex insulation, and has a 10-denier shell fabric with a DWR finish (to cut even more weight, a 7D fabric option is available). You won’t get fancy logos or much in the way of everyday appeal, but the Torrid Apex is beloved by long-distance hikers.
Another interesting ultralight synthetic jacket comes from Utah-based Nunatak with the PCT Pullover. The customization options are endless, from back and sleeve length to pockets and the actual amount of insulation. The PCT is warmer and heavier than the Torrid and built to handle tougher conditions, and both use continuous filaments for added durability. In terms of competition, that mostly comes from ultralight down jackets like the Mountain Hardwear Ghost Whisperer and various Montbell models, but the Enlightened Equipment and Nunatak prove that synthetic insulation is a real option for hardcore hiking and backpacking.
See the Enlightened Equipment Torrid Apex See the Women's EE Torrid Apex
Weight: 1 lb. 3.6 oz.
Insulation: PrimaLoft Gold Eco (133g + 40g)
What we like: Impressive warmth and weather protection in a lightweight package.
What we don’t: Overkill for most uses.
Since its debut literally decades ago, the DAS Parka has been a go-to synthetic jacket for winter climbers due to its impressive warmth and weather protection in a lightweight build. Retooled last year, the latest model is even lighter and more compressible and takes the cake as the warmest synthetic jacket in Patagonia’s lineup. And with a whopping 133 grams of PrimaLoft Gold Eco throughout and an extra 40 grams in the core, it’s the warmest option on this list too (which is impressive given its 1 lb. 3.6 oz. weight). In fact, the DAS Parka is so insulative that you won’t want to keep it on during any sort of movement, but it’s an ideal choice for cold belays, breaks while skiing, and other low-output activities.
It’s worth noting that the DAS Parka is built with a thin 10-denier shell, but unlike the Patagonia Micro Puff above, is made with stronger Pertex Quantum Pro fabric and topped with a coating for abrasion resistance. It all adds up to a jacket that’s meant to take a beating, and throughout our testing, it has held up very well to wear and tear. But with a price tag nearing $500, you’ll have to ask yourself if you really need the next-level warmth and premium features. For a step down, Patagonia also released their DAS Light Hoody above, which features 65 grams of PlumaFill insulation (similar to the Micro Puff) in a more durable, weather-resistant, and slightly heavier build... Read in-depth review
See the Men's Patagonia DAS Parka See the Women's Patagonia DAS Parka
Weight: 11.5 oz.
Insulation: Coreloft Continuous (65g)
What we like: Excellent wind resistance and warmth despite its minimalist design.
What we don’t: Heavier than the Micro Puff above.
Arc’teryx is no stranger to synthetic jackets: their versatile Atom LT remains an industry standard, while their Proton series (seen in the LT above) is active insulation at its finest. Another pillar of their synthetic collection is the Nuclei FL, a lightweight and packable hoody designed for fast-and-light alpine pursuits. Arc’teryx accomplishes this with the thin shell fabric, minimal feature set, and compressible insulation with remarkable loft. It all adds up to a jacket that is warmer than the Atom LT and a better option for weight- and space-conscious alpine climbers and skiers.
The Nuclei FL takes direct aim at Patagonia’s Micro Puff (also $299), but despite similar intentions, the two jackets have some key differences. First off, Arc’teryx’s jacket lives up to its windproof designation with a virtually impermeable shell fabric, while the Patagonia gives up a lot with its highly baffled design. On the other hand, the Micro Puff is more than 2 ounces lighter, which is significant. Both jackets suffer in the breathability department and have painfully thin shells (the Patagonia is slightly less durable)... Read in-depth review
See the Men's Arc'teryx Nuclei FL See the Women's Arc'teryx Nuclei FL
Weight: 12.3 oz.
Insulation: PrimaLoft Gold with Cross Core (60g)
What we like: A super versatile jacket for everything from casual use to hiking and skiing.
What we don’t: Fit runs a bit trim.
It’s tough to pin down the Packaway Jacket. On one hand, it looks fairly unassuming and L.L. Bean is known for trending toward the casual end of the spectrum. On the other, it uses high-end PrimaLoft Gold with Cross Core, an advanced technology that is claimed to be 15 percent warmer without adding extra weight. The result is a jacket that is warm, packable, performs well in the wet and wind, and looks the part for everyday use and travel. Given the very reasonable $169 price tag, that’s a whole lot of bang for your buck.
It’s worth noting that the Packaway Jacket was redesigned for last winter, including the unique PrimaLoft insulation described above, an updated baffle design, and the use of 100-percent-recycled materials (this is a growing trend in the outdoor industry that is catching on in a big way this year). Taking into account all of the features including pockets (two hand, one chest, and one internal), a waist cinch for adjustability, and the ability to stuff down relatively small, in many ways the Packaway resembles the popular Patagonia Nano Puff, only cheaper.
See the Men's L.L. Bean Packaway See the Women's L.L. Bean Packaway
Weight: 1 lb. 2 oz.
Insulation: G-Loft Supreme (60g)
What we like: Everyday appeal and premium build quality.
What we don’t: Pricey given its casual slant.
Many of the designs on this list have a performance slant, but few can match the casual appeal of the Keb Padded Hoodie. Simply put, this is one of the best-looking synthetic jackets on the market with the sleek styling that Fjallraven is known for. The insulation is 100% polyester called G-Loft Supreme, and the fibers are hollow and intended to create pockets of air like down (we’ve found that this is executed with varying degrees of success). And we appreciate details like hood and hem adjustments, a two-way main zipper, and ample pockets including one at the chest and one on the interior. Added up, the Keb is a great urban piece that also can work well for light fall and winter adventuring.
Like many Fjallraven gear items, the Keb Padded Hoodie is both expensive and has its limitations. Without a doubt, you don’t get the high-tech active insulation of similarly priced jackets from top brands like Arc’teryx and Patagonia, which means that breathability and packability aren’t as good. And for $250, you can get a nice down jacket that will offer even more warmth. But the Keb will perform better in wet conditions than down, and again, we love the look and build quality of Fjallraven products in general.
See the Fjallraven Keb Padded Hoodie See the Women's Keb Padded Hoodie
Weight: 1 lb. 4.3 oz.
Insulation: FullRange (60g)
What we like: Waterproof and extremely versatile.
What we don’t: Doesn’t pack down very well.
It’s difficult to even categorize Patagonia’s Stretch Nano Storm, but that’s probably a good thing. It’s definitely a synthetic, with the same 60-gram FullRange insulation as the Nano-Air above. And it’s legitimately a rain jacket, with Patagonia’s waterproof H2No shell fabric. Throw in a significant amount of stretch and a number of alpine-centric features like pit zips and a helmet-compatible hood (alpine, not ski), and you have yourself one heckuva Swiss Army Knife piece that can work for climbing, ski mountaineering, and a whole lot more.
The most obvious downside of the Stretch Nano Storm is cost: $399 can get you a very nice down jacket and it’s one of the most expensive models on this list (tied with the Macro Puff above). In addition, the Stretch Nano Storm does not pack down well, which somewhat limits its backcountry appeal. Finally, we like the athletic fit, which is less baggy than a traditional ski jacket, but means that it won’t take on layers quite as easily. But for serious adventurers who get out a lot of the winter, the Stretch Nano Storm is a very versatile piece to have in your quiver.
See the Men's Patagonia Stretch Nano Storm See the Women's Stretch Nano Storm
Weight: 9.5 oz.
Insulation: Coreloft (40g)
What we like: Lightweight with a great mix of protection and breathability.
What we don’t: Minimal insulation.
Arc’teryx’s Atom SL is one of the least insulated designs on our list but arguably one of the most versatile. This lightweight hoody excels during high-output activities like backcountry skiing, climbing, and even cold-weather running thanks to its excellent mix of protection, targeted warmth, and breathability. For insulation, you get a modest 40-gram Coreloft fill around the torso, while the side panels and underarms feature a thin fleece. Additionally, the shell and liner nicely balance wind and moisture resistance with enough air permeability to stay comfortable when working hard (it’s become an all-time favorite of ours while skinning). Last but certainly not least, its ultralight weight (our men’s medium is 9.5 oz.) and compressible build make it easy to squeeze into just about any pack.
The flipside of the Atom SL’s high-output performance is that it’s not very warm. Simply put, this relatively thin jacket shouldn’t be your only form of insulation if temperatures dip below about 50 degrees Fahrenheit. This makes it far less of an all-rounder compared with our top picks above in terms of shoulder-season use around town or as your midlayer in the cold. That said, the SL fits nicely under a warmer jacket thanks to its slim cut and minimalist hood (you can even roll the hood up and secure it to the collar). In the end, its combination of a relatively steep $229 price and limited warmth makes the Atom SL a bit of a niche piece, but for the right user and temperature range, it’s a near-perfect active layer... Read in-depth review
See the Men's Arc'teryx Atom SL See the Women's Arc'teryx Atom SL
Weight: 1 lb. 6.9 oz.
Insulation: VerticalX (80g)
What we like: Super tough and great range of movement.
What we don’t: Heavy and limited packability.
The regular, softshell version of the Ferrosi has a cult-like following among climbers and ski tourers for its combination of comfort, breathability, and the ability to block wind, but in the cold most people throw it over an insulated jacket. Outdoor Research wised up and launched the Winter Ferrosi with the addition of VerticalX insulation. The result is an absolute beast of a synthetic that is among the warmest and toughest on this list. If you like to head out in the winter without worrying much about the elements, we really like this jacket.
The Achilles' heel of the Winter Ferrosi is bulk. The burly 90-denier shell and healthy amount of insulation put it among the heaviest models on this list (and that's for the non-hooded model as the hoody has been discontinued), and it won’t stuff down small in your pack. If you know you will be wearing the Winter Ferrosi most of the time (on a cold-weather hike or bike ride, for example), it’s a great choice. But for those carrying their belongings in a pack for extended periods, we prefer a lighter and less substantial piece.
See the Men's OR Winter Ferrosi See the Women's OR Winter Ferrosi
|Arc’teryx Atom LT Hoody||$259||13.2 oz.||Coreloft Compact (60g)||20D||No|
|Patagonia Nano-Air Hoody||$299||12.2 oz.||FullRange (60g)||33D||Yes|
|Stoic Insulated Stretch||$100||1 lb. 8 oz.||100% Polyester||Unavail.||No|
|Patagonia Micro Puff Hoody||$299||9.3 oz.||PlumaFill (65g)||10D||Yes|
|Arc'teryx Proton LT||$299||14.7 oz.||Coreloft Compact (60g and 80g)||20D||No|
|Patagonia Nano Puff||$199||11.9 oz.||PrimaLoft Gold Eco (60g)||20D||Yes|
|The North Face ThermoBall Eco||$199||15.2 oz.||PrimaLoft ThermoBall Eco||20D||Yes|
|Patagonia DAS Light Hoody||$329||11.3 oz.||PlumaFill (65g)||10D||Yes|
|Black Diamond First Light Stretch||$259||1 lb. 0.7 oz.||PrimaLoft Silver Active (60g)||40D||Yes|
|Outdoor Research Refuge||$220||1 lb. 4.1 oz.||Vertical X (60g)||20Dx30D||Yes|
|Rab Xenon||$195||12.7 oz.||Stratus (60g)||20D||Yes|
|Enlightened Equipment Torrid||$170||8.4 oz.||Climashield Apex (65g)||10D||Yes|
|Patagonia DAS Parka||$449||1 lb. 3.6 oz.||PrimaLoft Gold Eco (133g+40g)||10D||Yes|
|Arc'teryx Nuclei FL||$299||11.5 oz.||Coreloft Continuous (65g)||10D||Yes|
|L.L. Bean Packaway||$169||12.3 oz.||PrimaLoft Cross Core (60g)||20D||Yes|
|Fjallraven Keb Padded Hoodie||$250||1 lb. 2 oz.||G-Loft Supreme (60g)||Unavail.||No|
|Patagonia Stretch Nano Storm||$399||1 lb. 4.3 oz.||FullRange (60g)||30D||No|
|Arc'teryx Atom SL Hoody||$229||9.5 oz.||Coreloft (40g)||20D||No|
|Outdoor Research Winter Ferrosi||$199||1 lb. 6.9 oz.||VerticalX (80g)||90D||No|
- Types of Synthetic Insulation
- Water Resistance
- Hood or No Hood?
- Durability and Care
The shape and texture of synthetic insulation varies significantly. Some are sheet-like in appearance with a continuous filament pattern, creating a buffer of warmth like a blanket. Other newer versions mimic the shape and loft of actual down clusters but with added water resistance. Below we break down some of the most common synthetic insulation types on the market in 2021.
Much of the surge in synthetic insulation can be credited to PrimaLoft. It was well-known for years that down insulation struggles when wet, but there wasn’t a product that could compete in packability and warmth for the weight. PrimaLoft changed that, and the brand became synonymous with lightweight warmth on popular jackets like the Patagonia Nano Puff. The PrimaLoft lineup has increased substantially in recent years, so much so that it’s hard to keep track of all the options. PrimaLoft Gold is the current standout, with numerous adaptations within that category (Active, Eco, Luxe, etc.). The company also makes Silver and Black, and all types share core benefits of compressibility, breathability, and good warmth for the weight.
This type of insulation actually is a variation of PrimaLoft, but in a unique application made by The North Face. Rather than a flat sheet of insulation, Thermoball uses PrimaLoft synthetic in clusters to mimic down insulation. It does a really nice job of doing this, with heating efficiency equally a claimed 600-fill-power down jacket. It’s also decently compressible and lightweight, which has made The North Face ThermoBall a popular choice for hiking, skiing and travel—not to mention for daily wear.
Most proprietary synthetic technologies are decent, not top performers, but Arc’teryx has a real winner in their Coreloft fill. Found in everything from their popular Atom LT Hoody to areas vulnerable to moisture in their creative down/synthetic hybrid Cerium LT, Coreloft is a staple for lightweight, hydrophobic warmth. Arc’teryx are purists in that they don’t buy into hydrophobic down, and their consistent use of synthetic insulation in insulated wet-weather gear is a testament. They've also expanded the line to include Coreloft Compact, which stacks up well to FullRange and Polartec Alpha in terms of breathability.
FullRange and Polartec Alpha
Although they are different brands, FullRange by Patagonia and Polartec Alpha are direct competitors in performance synthetics. They share a common goal: high breathability for high-output activities. And they’re both quite successful at it, despite having slightly different technologies. The downside of both types of insulation is they don’t keep you as warm when you’re not moving. More air moving through the insulation means less heat retention. We recommend FullRange and Polartec Alpha for activities like climbing, ski touring, and light mountaineering when you’re most prone to overheating.
With the much-anticipated Micro Puff jacket, Patagonia debuted their proprietary PlumaFill insulation. Like Thermoball above, PlumaFill is built to behave like down, with synthetic filaments and fibers that even look like goose and duck plumage. Patagonia claims that this new tech offers the best warmth-to-weight ratio of any jacket they’ve created, down or synthetic. That’s a tall order, but PlumaFill certainly is among the lightest, warmest, and most packable synthetics on the market in 2021, and we’ve been impressed throughout seasons of wearing the Micro Puff. It’s worth noting that Patagonia currently only uses PlumaFill in a few jackets including the Micro Puff, Macro Puff, and DAS Light Hoody.
The single biggest selling point of synthetic fill over down fill is that it retains its ability to insulate when wet. With a down jacket, prolonged exposure to rain or snow will eventually lead to soaked feathers, causing them to lose their loft and warmth-creating potential. Even new hydrophobic down technologies eventually give in to sustained moisture. A wet down jacket is heavy, won’t keep you warm, and takes much longer to dry out than a synthetic one. Synthetic insulation resists moisture and water instead sits between the fibers, allowing them to retain their shape, continue to insulate, and dry more quickly. The degree to which synthetic insulation resists water varies by type, but all synthetics repel moisture much better than down.
On both sides of the aisle, gear manufactures are commonly adding a DWR (durable water repellant) treatment to insulated jackets. This helps water bead off the shell instead of collecting and eventually soaking through to the interior of the jacket. DWR treatments do a pretty good job at repelling light to moderate precipitation, but by no means waterproof the jacket. Synthetic jackets do a much better job than down in wet conditions, but for prolonged exposure you will want to consider a rain shell.
Synthetic insulation creates less warmth for its weight than down. For example, you can expect that a 12-ounce down jacket will be noticeably warmer than a 12-ounce synthetic jacket. However, synthetics still do a pretty respectable job in this department and are only getting better. Gear manufacturers continue to innovate with new and improved “down-like” synthetics hitting the market year after year.
There is a significant amount of variation in the warmth of our synthetic jacket picks above. Popular models like the Patagonia Nano Puff and Arc’teryx Atom LT fall into the lightweight category: both weigh around 12 ounces and are designed for cool-weather fall and spring use. Jackets like the Black Diamond First Light Stretch weigh approximately 17 ounces and are more midweight pieces. For freezing winter conditions, parkas like Patagonia's DAS are true winter-weight synthetic jackets. And although these jackets are quite warm, the vast majority of our picks for the best winter jackets have down fill.
It’s tough to gauge exact temperature ranges as comfort is relative and depends on factors like layering, humidity, and even the age and circulation of the person wearing the jacket, but our estimates are as follows: lightweight synthetic jackets are great for temperatures from around 40 to 65 degrees Fahrenheit with little in the way of layering (you can buy yourself some more warmth by adding a cozy baselayer). Midweight jackets can take you down to about 20 degrees Fahrenheit, particularly if you’re active and getting some blood flow. Heavyweight parkas can handle the toughest conditions down to well below freezing.
Down fill has relatively average breathability, and given its warmth-to-weight ratio, a down jacket can cause you to overheat during high-exertion activities. Further, when you are sweating inside a down jacket, you are actually hurting its insulating properties as your water vapor comes into contact with the down feathers.
In terms of synthetic insulation, breathability varies but newer breeds are really excelling in this category. For example, the FullRange insulation on the Patagonia Nano-Air is extremely impressive in terms of its breathability and we’ve loved it as a piece for activities like winter running and cross-country skiing. The Arc'teryx Proton LT and its Coreloft Compact insulation is another jacket that trumpets breathability. And because synthetic jackets generally are less fragile and less prone to leakage than down jackets, a wider variety of breathable shell fabrics can be used.
If the purpose for your jacket involves movement, the Nano-Air and Proton LT are great choices and will far outperform down. Some other types of synthetic insulation like standard Coreloft and PrimaLoft don’t breathe as well as those performance jackets, but their hydrophobic nature, which helps pull moisture away from the fibers, means they remain a better choice as active wear. And the parkas on this list are meant for belaying or hunkering down in cold weather, not for highly active use.
Unfortunately, synthetic insulation doesn’t compress as tightly as down (along with warmth, this is one of its big selling points). This means that folks like thru-hikers and ultralight ounce-counters favor down jackets for their ability to stuff down extremely small in the bottom of a pack and bounce back quickly when opened. However, many of the synthetic jackets on this list either pack down into a pocket or have a separate stuff sack that makes them reasonably small. They won’t be as small as down in nearly all cases (Patagonia’s Micro Puff and DAS Light Hoody come close), but for casual use and adventuring when space isn’t at an absolute premium, synthetics will pleasantly surprise you with their packability.
Synthetic jackets are comfortable thanks to their ability to regulate your body temperature. They’re the kind of mid or outerlayer that you can be wearing out in the cold and not have to immediately peel off as you come indoors. The same is true when used as an active piece. You’ll find yourself keeping it on for far longer than an equivalent down jacket.
For example, here in Seattle, we often put on a jacket like the Arc’teryx Atom LT or Patagonia Nano-Air when we leave the house and can wear it literally all day. We can walk the dog in 45-degree weather, then move indoors to the office without missing a beat. These synthetics are incredibly comfortable and breathe well enough even for indoor use—you feel like you are wearing your favorite hoody or fleece. If we were to put on a comparable down jacket like the Arc’teryx Cerium LT, it would be too warm for physical activity or sitting indoors. So although down undoubtedly is warmer, we save it for uses like backpacking when we really value the warmth-to-weight.
Many of our top-ranked synthetic jackets are offered in either a hoody or non-hoody style. What’s best for you will come down to use: we reach for an insulated vest or non-hooded jacket as a midlayer while skiing or around town, and the hoody is great as an outerlayer or if it’s really cold. For stop-and-go cold-weather activities like fall hiking, ski touring, or snowshoeing, a hoody is nice to have for keeping you warm while taking a break. Expect to pay $20 to $50 extra for the hoody version of the same piece. A down jacket purchase shares many of the same considerations, and we’ve covered this question in greater detail in the article: Does Your Down Jacket Need a Hood?
A great thing about synthetic jackets is that they are easier to care for than down jackets. First, you don’t have to worry as much about moisture and they don’t lose feathers, meaning that you don’t have to be as vigilant about keeping a close eye on your jacket. Synthetic insulation will break down over time, but it’s certainly not as fragile at the outset. Second, most synthetic jackets are machine washable and don’t require special supplies and care for cleaning. We do not recommend drying your synthetic jacket on high heat no matter what it says on the instructions, but this process goes a whole lot more smoothly than with down.
Last but certainly not least, you get more bang for your buck with synthetic insulation. New synthetic jackets from top brands like Arc’teryx and Patagonia are still pricey, but synthetic insulation is cheaper to produce and this is reflected in the price tag. The cost of goose down has been going up, further incentivizing gear manufacturers to come up with new and sustainable down alternatives. No one has created a true down alternative yet that can replicate the warmth and compressibility, and for these reasons, down remains in high demand and therefore more expensive. Look for the synthetic market to continue to evolve, pushing ever closer to a true down replacement at a lower cost.
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