Mountain Hardwear Ghost Whisperer UL

Price: $375
Weight: 6.17 oz. (women’s medium)
Fill: 1.92 oz. of 1,000-fill down
What we like: Impressive combination of warmth and weight for moderate temperatures.
What we don't: Less durable and more limited feature set than the competition.
See the Women's Ghost Whisperer UL  See the Men's Ghost Whisperer UL


For years, Mountain Hardwear’s Ghost Whisperer down jacket has dominated the ultralight market, offering impressive warmth in a streamlined package. Released for fall 2020, their Ghost Whisperer UL carries the torch even further, combining higher-quality down with an even thinner shell fabric for a truly featherlight jacket. Throughout testing, we appreciated the minimalist layer during long trail days and ski tours and found that it provides just the right amount of shelter against a shoulder-season chill. Below we break down our experiences with the Ghost Whisperer UL. To see how it stacks up to the competition, see our article on the best down jackets.

Table of Contents


Weight and Packability

We won’t mince words: at only 6.17 ounces for the women’s medium, the Mountain Hardwear Ghost Whisperer UL is crazy light. Cutting weight is this jacket’s main prerogative, and it accomplishes the task with flying colors. The UL has just enough down (1.92 oz. of 1,000-fill) to insulate you against a shoulder season or summer evening chill, and a bare-bones feature set sheds weight throughout. In terms of the competition, the UL is impressively lightweight: the Arc’teryx Cerium SL (“superlight”) Hoody is 7.2 ounces and Mountain Hardwear’s standard Ghost Whisperer (previously their lightest jacket) is heavier at 7.8 ounces. Montbell’s Plasma 1000, on the other hand, clocks in at only 4.1 ounces, but keep in mind it’s significantly less insulated with a total of 1.3 ounces of 1,000-fill down and doesn't include a hood. Mountain Hardwear Ghost Whisperer UL (chest logo)

In terms of packability, given the Mountain Hardwear’s minimalist intentions, we were surprised to see that it didn’t come with a stuff sack or feature a two-sided pocket zipper. It is possible to stuff it inside one of its handwarmer pockets and finagle the zipper closed—packed up, the jacket is roughly the size of a 1-liter Nalgene bottle. Most of the time, however, the Ghost Whisperer UL packs away better when unstuffed and does a great job filling the nooks and crannies of my pack. It was a perfect companion during long trail jogs this spring and took up very little space in the rear compartment of my running vest. Mountain Hardwear Ghost Whisperer UL (packed size)


Down jackets are highly efficient insulators, and the Ghost Whisperer UL has proven to be a good match for moderately cold temperatures. This spring, it was all I needed to stay warm during breaks on the trail or skin track, and I was happy to have it this summer for evening insulation during ultralight fastpacking and thru-hiking missions. But with only 1.92 ounces of 1,000-fill down, it’s important to recognize the Ghost Whisperer UL’s limitations. In short, it’s great for brief breaks during high-output activity or to protect against a summertime chill, but you’ll likely want more jacket when the temperatures drop into the 40s or below. Competing ultralight jackets offer similar warmth: the Arc’teryx Cerium SL combines 1.73 ounces of 850-fill down with synthetic Coreloft insulation, while the standard Mountain Hardwear Ghost Whisperer/2 has slightly more down (2.5 oz.), but at a lower quality (800 vs. 1,000-fill power).Mountain Hardwear Ghost Whisperer UL (1000-fill down sleeve)

Weather Protection

The Mountain Hardwear Ghost Whisperer UL is not our first (or fifth) choice for use in inclement weather, but its durable water-repellant (DWR) finish puts up a good defense against moisture. However, with such a thin nylon face fabric (5D), there’s very little barrier between precipitation and plumage, which doesn’t give you much wet-weather assurance (and unlike the standard Ghost Whisperer/2, the UL does not use QShield hydrophobic down). For an ultralight insulated jacket that offers more protection in rain, the Patagonia Micro Puff Hoody (8 oz. for the women’s small) is a synthetic jacket that stays warm even when wet.

In terms of wind protection, the Ghost Whisperer UL’s thin nylon face fabric and minimal down fill makes it noticeably air permeable. In fact, on a clear but breezy early-summer evening on Mt. Bachelor’s summit, we would have gladly traded the Ghost Whisperer UL for a windbreaker jacket like the Patagonia Houdini Air (3.6 oz.), which is much better at trapping body heat in windy conditions. In the end, the UL is at its best as a midlayer or as a standalone piece in calm conditions.Mountain Hardwear Ghost Whisperer UL (snowshoeing)

Features: Pockets and Hood

The Mountain Hardwear Ghost Whisperer UL is designed with a no-frills feature set that keeps weight to a minimum. Two handwarmer pockets sit right above the hip (read: difficult to access with a hipbelt on) and have insulation on the outside to keep your hands cozy. The cuffs are a simple elastic band, and the hood fits relatively close to the head and features a small brim and elastic along the face, but no rear adjustment. It’s a minor gripe, but I do wish the hood were slightly smaller, as it threatens to come off in a light breeze and the elastic rim does little to secure it around my head. Finally, our jacket forgoes a hem adjustment but features a thin piece of elastic across the rear (note: we received a sample for this test, and the jacket now comes with a drawcord hem adjustment for dialing in fit and sealing out drafts).Mountain Hardwear Ghost Whisperer UL (hands in pockets looking down)

Build Quality and Durability

If we know anything about ultralight gear, it’s that durability usually drops with weight. Simply put, thicker (read: heavier) fabric will stand up better to wear and tear. With 5-denier (D) ripstop nylon face fabric, the Mountain Hardwear Ghost Whisperer UL is decidedly on the thin side, and the #3 YKK zippers are incredibly delicate. A few other jackets use 7-denier nylon (including the Arc’teryx Cerium SL and Montbell Plasma 1000), but the UL is the first time we’ve seen a jacket drop as low as 5D. Given its thin makeup, it’s important to be clear on the UL’s intentions: this is a jacket designed for users pushing the limits of light and fast (we’re talking trail runners, fastpackers, thru-hikers, and ski mountaineers) and should not be bought as an around-town piece. Finally, it’s important to treat the Ghost Whisperer UL with a great deal of care, being especially cautious around abrasive rocks or when stuffing it away in a pack.Mountain Hardwear Ghost Whisperer UL (front zipper)

In terms of quality, we’ve been pleased with our Mountain Hardwear gear of late. While our Ghost Whisperer UL largely follows suit, there are a few details that are disappointing in terms of fit and finish. For one, the jacket’s stitching is messy in places, and the serger seam is exposed on the inside of the pockets. Further, the hem features a band of elastic across the back, but mine has very minimal stretch and does little to keep the jacket cinched close to my body. But again, it’s important to mention that we received a sample of this jacket (not the final production run), and Mountain Hardwear did add a hem cinch since our test.Mountain Hardwear Ghost Whisperer UL (pulling out of running vest)

Fit and Sizing

We opted for our usual size small in the Ghost Whisperer UL and found that it fits true to size. The jacket features the trim fit we’ve come to expect from such a minimalist piece, but you still get ample coverage throughout (the UL falls nicely below my hips). Keep in mind this jacket comes with minimal adjustments (no cuff straps or hood drawcord), so if you like to batten down the hatches, you’ll want to look elsewhere.Mountain Hardwear Ghost Whisperer UL (zipping up)

Other Versions of the Mountain Hardwear Ghost Whisperer

For this review, we tested the women’s version of the Ghost Whisperer UL, and the jacket is also made in a men’s model with the same overall design, colorway options, and price ($375). The only notable difference is weight, with the men’s Ghost Whisperer UL clocking in slightly heavier at 6.7 ounces. And as we’ve mentioned above, the Ghost Whisperer UL is an ultralight version of the popular Ghost Whisperer/2, which has long been Mountain Hardwear’s lightest down jacket. The women’s Ghost Whisperer/2 hooded jacket tips the scales at 7.8 ounces, is cheaper at $325, and has a slightly different construction and feature set (more on this below). 

Sustainability: Responsibly Sourced Down

We’ve seen outdoor gear companies make an encouraging shift towards using ethically sourced down, and Mountain Hardwear is no exception. The Ghost Whisperer UL features RDS-certified plumage, which ensures that no birds were unnecessarily harmed (live plucking or force feeding, for example) in the production of the jacket. It’s worth noting that the standard Ghost Whisperer has a 100-percent-recycled face fabric, while the UL version does not. And there are other potential areas for improvement—including switching to a PFC-free DWR coating—but we appreciate that Mountain Hardwear is taking steps in the right direction.Mountain Hardwear Ghost Whisperer UL (elastic cuff)

What We Like

  • One of the lightest down jackets ever made, with premium 1,000-fill down and an ultra-thin 5D ripstop nylon face fabric.
  • Insulates against a light chill but packs down very small, perfect for trail running, thru-hiking, and fastpacking.
  • Ample warmth for moderate shoulder-season temperatures and summer nights.

What We Don’t

  • Only slightly lighter than competing jackets, but with thinner materials and a more limited feature set.
  • Thin 5D face fabric and #3 YKK zippers mean this jacket isn’t for daily use, and the user will need to exercise a great deal of caution.
  • The hood is a little large and does not have an adjustment.
  • For protection in windy weather, a windbreaker jacket would provide similar warmth for a lighter weight.

Mountain Hardwear Ghost Whisperer UL (packed in running vest 2)

Comparison Table

Jacket Price Weight Fill Power Fill Weight Denier Packable
MTN Hardwear Ghost Whisperer UL $375 6.17 oz. 1,000 fill 1.92 oz. 5D No
Arc'teryx Cerium SL Hoody $359 7.2 oz. 850 fill 1.73 oz. 7D Stuff sack
Montbell Plasma 1000 $329 4.1 oz. 1,000 fill 1.3 oz. 7D Stuff sack
MTN Hardwear Ghost Whisperer/2 $325 7.8 oz. 800 fill 2.5 oz. 10D Hand pocket
Feathered Friends Eos $339 9 oz. 900 fill 2.8 oz. 12Dx20D Stuff sack
Patagonia Micro Puff Hoody $299 8 oz. Synthetic fill Unavailable 10D Hand pocket

The Competition

The Ghost Whisperer UL is new to the ultralight down jacket scene, but it joins a competitive group of models from some of the industry’s most premium brands. The Arc’teryx Cerium SL Hoody is a strong contender in terms of warmth, with 1.73 ounces of 850-fill down paired with 40/80-gram Coreloft synthetic insulation in areas prone to moisture build-up (known as Down Composite Mapping). Both jackets are constructed with thin face fabric, although the Ghost Whisperer is thinner at 5-denier (compared to the Arc’teryx’s 7D) and weighs slightly less at 6.17 ounces for the women’s medium (compared to the Cerium SL’s 7.2 oz.). But the true tipping point for us is the feature set: the Arc’teryx comes with an adjustable hood and manages to undercut the Ghost Whisperer in price by $16.Mountain Hardwear Ghost Whisperer UL (hood)

The Montbell Plasma 1000 gives ultralight jackets a run for their money, with a ridiculous 4.1-ounce weight and 1.3 ounces of 1,000-fill-power down. Like the Cerium SL, the Plasma is made with 7-denier face fabric, and Montbell uses a quilted baffle pattern to maximize heat retention. At $329, the Plasma will save you some cash over jackets like the Ghost Whisperer UL and Cerium SL, but keep in mind that it doesn’t come with a hood, which can be a deal breaker for those using this as a standalone piece (rather than just a midlayer jacket). If weight matters more than anything, the Plasma is an attractive choice, but most of the time we’d opt for the increased insulation and hood of the Ghost Whisperer UL.

Before the Ghost Whisperer UL was the Ghost Whisperer/2, which weighs about an ounce and a half more at 7.8 ounces and retails for $50 less ($325). The standard Ghost Whisperer opts for 10-denier nylon (compared to the UL’s 5D) and is packed with 2.5 ounces of 800-fill down, which is slightly more insulation at a lower quality (in other words, it's only a little warmer). Additionally, the standard Ghost Whisperer is more durable thanks to the 10D shell, and it packs into its own pocket (which has an internal carabiner clip for attaching to a pack or harness). In the end, unless you need the lightest of the light, we have a hard time justifying the Ghost Whisperer UL over the original.Mountain Hardwear Ghost Whisperer UL (putting hood on)

Stepping up in weight, Feathered Friends’ Eos Down Jacket has been a favorite of ours for years. Right off the bat, we’ll note that this isn’t a highly specialized, minimalist piece like the Ghost Whisperer UL. Weight jumps to 9 ounces, and you get 2.8 ounces of high-quality 900-fill down, a weather-resistant Pertex Quantum shell, and a functional feature set including a hood, zippered hand pockets, an adjustable hem, and a stuff sack for packing the jacket down. Again, if weight is your top priority and the conditions won’t be too cold, go with the Ghost Whisperer UL. But the Eos is one of the most well-rounded lightweight down jackets on the market and an excellent value at $339.

Finally, for those who venture out in inclement weather, the Patagonia Micro Puff Hoody is well worth considering. The Micro Puff is filled with Patagonia’s proprietary 65-gram PlumaFill insulation, which mimics the heat-trapping abilities of down but with the bonus that it doesn’t lose its loft when wet. With a 10-denier nylon face fabric the Patagonia is technically more durable than the Mountain Hardwear, although we’ve put countless holes in our jacket while climbing. Compared to the Ghost Whisperer UL, the women’s Micro Puff weighs slightly more at 8 ounces and doesn’t pack down quite as small, but for a big savings ($299) and wet-weather assurance it’s a great ultralight option.

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