Ultralight Down Jackets: A Deep Dive
Nimbly balance warmth and weight with these super-packable puffies.
Ultralight down jackets are the sports cars of the outdoor gear world. They’re sleek, expensive, and unapologetically performance-oriented, designed with one goal in mind: to provide a welcome dose of warmth while keeping weight down and packability high. These minimalist puffies are excellent choices for alpine missions, thru-hikes, or any trip where pack space is a concern but you still want to carry a cozy midlayer. Ultralight down is a crowded field these days—every brand wants their own flashy sports car, after all—but here are Better Trail’s hand-picked standouts, as well as a couple of synthetic alternatives.
Tips the scales at: 10.7 oz. (men’s), 8.5 oz. (women’s)
Insulation: 3 oz. of 800 FP down
What it is: Quality build that’s sneaky versatile for casual and backcountry wear.
What it isn’t: At the tippy top of warmth-for-weight.
This classic puffy was at the forefront of the ultralight down revolution of the early 2010s, and the Ghost Whisperer is still a category mainstay. It has all the hallmarks of what we look for in a minimalist puffy, with a super-streamlined build that weighs just over half a pound and packs away into its own hand pocket to the size of a large eggplant. We’ve worn the Ghost Whisperer extensively, and it’s a great puffy for providing just enough warmth for shoulder-season missions or hanging around camp on summer nights in the mountains.
However, this jacket is no longer among the category’s vanguard when it comes to materials and performance. Containing 3 ounces of 800-fill down, the Ghost Whisperer’s insulation has been surpassed in both fill power and total weight by competitors such as the Rab Mythic G (4.5 oz. of 1,000 FP down) and the La Sportiva Lumina 200 (4.4 oz. of 1,000 FP down). We’re not saying that the Ghost Whisperer doesn’t do what it’s intended to—keep you warm in temps from around 40 to 60 degrees, while taking up a minimum of space in your pack—but if you want to push your ultralight into colder conditions, it’s been surpassed.
If you want to go even lighter but stick with the Ghost Whisperer’s general design, Mountain Hardwear now offers a souped-up version called the Ghost Whisperer UL Hoody. It’s much more expensive, has thinner material (7D nylon, compared to the OG’s 10D nylon), weighs a scant 6.7 ounces, and contains the 1,000-fill down that’s become the category standard for maximizing lightweight warmth. However, the UL’s fill weight is only 2.4 ounces—that’s even less than the standard Ghost Whisperer, and far less than the Mythic G and the Lumina. It may be more packable, but overall warmth will still be mediocre.
Tips the scales at: 4.9 oz. (men’s), 4.2 oz. (women’s)
Insulation: 1.6 oz. of 1,000 FP down
What it is: Silly UL midlayer that pulls out all the stops.
What it isn’t: Versatile or durable.
If grabbing the absolute lightest down jacket is your goal, get a load of the Plasma 1000. At a ridiculous 4.9 ounces, it will barely register on your scale, and it undercuts the Ghost Whisperer UL by 1.8 ounces. The Plasma is stuffed with premium 1,000-fill-power down, and only 1.6 ounces of it. Add that to its wispy 7-denier nylon shell, and you get a jacket that packs away into its included stuff sack to roughly the size of two softballs. All of the models in this article are super-packable, but the Plasma takes it to another level—it’s crazy compact, and is a no-brainer for throwing in small daypacks or even a mountain biking hip pack for just-in-case warmth.
Achieving this level of minimalism, however, means major concessions to its warmth and feature set. Despite its high-loft down, the Plasma’s rock-bottom fill weight will only keep you toasty enough for mild conditions; this is a jacket that can take the edge off the chill when the sun hides behind clouds, but we wouldn’t trust it as a standalone insulator in the shoulder seasons. It also lacks a hood and has a short hem that might not work for everybody. (If you want head coverage, Montbell offers the hooded Plasma 1000 Alpine Down Parka, which weighs 8.4 oz. and contains 3.4 oz. of 1,000 FP down, for $469.) The Plasma’s 7-denier nylon shell is par for the category (that is, it’s fragile and should be treated with care), and cements its placement as an intriguing—but niche—ultralight layer.
Fill Power and Fabric Denier
The two main design elements that enable ultralight down jackets to achieve their low weights and outstanding packability are high-fill-power down and thin fabrics. Basically, fill power measures down’s loft; down that has a higher fill power (more loft) is warmer for its weight and bulk than lower-fill down (less loft). Ultralight puffies contain down with fill powers of 800 or higher that maximize their ability to retain heat with relatively little (and highly compressible) insulation compared to heavier, bulkier puffies.
Fabric denier, or “D,” corresponds with the thickness of a given material, and thus (roughly) its durability. To keep their weights worthy of the “ultralight” tag, the jackets here are made with fabric that’s much thinner than the materials you’ll usually see on down puffies—7-denier nylon is pretty much the category standard, compared with the 20-denier fabric found on heavier competitors. Of course, using delicate materials results in the biggest drawback to ultralight puffies: they’re far less durable than standard insulating layers and more prone to holes and tears. If you buy one of the jackets in this guide, make sure to avoid grabby branches, sharp rocks, and other damaging environments. Or, at minimum, pack some Tenacious Tape.
Tips the scales at: 8.3 oz. (men’s), 7.2 oz. (women’s)
Insulation: 4.4 oz. of 1,000 FP down
What it is: A technical tour de force at a surprisingly decent price.
What it isn’t: Widely available—stock is hit or miss.
The Lumina 200 may boast the most impressive warmth-to-weight ratio of any ultralight down puffy, as well as the best value. Although it costs $20 less than the Mountain Hardwear Ghost Whisperer Hoody and more than $150 less than the Rab Mythic G below, the Lumina is far warmer than the former and just slightly less toasty than the latter, thanks to 4.4 ounces of 1,000-fill down, all while offering a slim-yet-mobile cut that furthers its technical intentions. If there’s one minimalist down puffy that’s best cut out for blunting the cold on climbs, hikes, and ski tours where every ounce matters, this is it.
In fact, La Sportiva’s entire 1,000-fill Lumina line is impressive in terms of its products’ specs and pricing. The hoodless Lumina 100 ($289) weighs 6.1 ounces and contains 2.5 ounces of fill, making it a legit alternative to the Montbell Plasma 1000. Even the big sibling of the bunch, the Lumina 300 ($439), doesn’t exactly tip the scales at 12.3 ounces. It slots in between the Arc’teryx Cerium ($400; 11.9 oz.; 4 oz. of 850 FP down) and the REI Co-op Magma 850 ($259; 850 FP down) weight-wise, but provides a higher level of lofty warmth than both thanks to a head-turning 6.2 ounces of fill. Indeed, the only real issue we can find with the Lumina line is its availability—all of these jackets are highly specialized, technical pieces that aren’t produced in the same numbers as more broadly appealing models, so La Sportiva’s stock depletes quickly.
Tips the scales at: 9.8 oz. (men’s), 8.9 oz. (women’s)
Insulation: 4.5 oz. of 1,000 FP down
What it is: Alpine-ready level of warmth and feature set.
What it isn’t: A good value.
In terms of pure warmth, the Mythic G is the ultralight down jacket best-equipped to handle freezing conditions. It’s stuffed with 4.5 ounces of 1,000-fill down, and also features a reflective lining intended to slow heat loss. That lining, plus quality-of-life touches like an adjustable hem, a stiffened brim on the elastic hood, and sizable hand pockets, causes the Mythic G to weigh a bit more than the Lumina 200 above, but it still comes in below 10 ounces and packs down to the size of a 1-liter, all-in-one backpacking stove. (It’s also a tad warmer than the Lumina 200 and a heck of a lot more insulating than just about every other jacket in the category.)
Our Mythic G reviewer, Landon Ernest-Beck, took this technical hoody on an epic five-week adventure, including a bike ride from Washington state to British Columbia, a bushwack into the remote Waddington Range, and a summit of Mt. Waddington. Through it all, the jacket blew him away with its technical chops: it kept him warm in sub-freezing temps, the hood stretched to fit over his climbing helmet without feeling bulky or oversized, and it offered sufficient range of motion while climbing and cycling.
Our biggest complaint about the Mythic G is its price. At $550, it’s not just a bit more expensive than the competition; for the price difference between it and the equally standout Lumina, you could buy another highly functional midlayer like the Patagonia R1 Air Fleece Jacket ($165). And it’s not as if the Mythic G is built to last longer than the other jackets we’re covering here. Its 7-denier nylon shell is just as delicate as the face fabrics of its ultralight adversaries, and you might notice rips and stray feathers a lot more when you’re paying more than half a grand. You won’t be disappointed with how the Mythic G feels in the mountains, but there’s better value elsewhere.
Tips the scales at: 6.8 oz.
Insulation: 3.4 oz. of 900 FP down
What it is: Desirable middle-ground of warmth at a very low weight.
What it isn’t: Refined.
An established brand in the small-but-chummy world of cottage ultralight gear, Zpacks is probably best known for its tents and backpacks. The creatively named Down Jacket certainly fits with the company’s ethos, though, with a design that’s light enough for thru-hiking yet impressively full-featured. The hoodie’s 3.4 ounces of 900-fill down occupies the middle ground between the Ghost Whisperer’s 800-fill insulation and 1,000-fill contents of the Lumina and the Mythic G, which helps keep the price reasonable (for an ultralight hooded down midlayer, at least) and provides a solid level of warmth for its sub-7-ounce weight.
Given how light this puffy is, its feature set is particularly noteworthy. In addition to its hand pockets, the Down Jacket has an internal zippered chest pocket that doubles as a stuff sack and an adjustable hem. However, it’s bulkier than the models we’ve covered so far when packed—about the size of a large, square hardcover book—and its overall aesthetic isn’t as polished. Add in the fact that it only comes in unisex sizing, and it’s clear that there are a few caveats to keep in mind. If a high warmth-to-weight ratio is your top priority, though, this jacket is still a smart purchase.
Synthetic Alternatives
You don’t necessarily need a down jacket if you want ultralight warmth. Synthetic insulation has come a long way, with some varieties now mimicking down’s heat retention and packability to an impressive degree.
Puffies that use synthetic fill are usually less expensive, and they have the major advantage of keeping you warm even when they’re wet—while down loses its loft and, thus, its ability to insulate when it gets soaked, synthetic alternatives do not. That's a big deal if you tend to get outside in soggy environments, or if there’s lots of precipitation in the forecast for an extended backcountry trip.
Tips the scales at: 10.5 oz. (men’s), 9 oz. (women’s)
Insulation: 65g PlumaFill
What it is: Patagonia quality, down jacket-like performance.
What it isn’t: A small step down in its warmth-to-weight.
Patagonia’s PlumaFill material is one of the best synthetic dupes for natural down that we’ve seen, and it excels as the stuffing of the Micro Puff Hoody. This jacket is comparable to the Ghost Whisperer in terms of weight and packability, although it feels slightly less warm.
The Better Trail team has thrown the Micro Puff into our climbing packs for alpine missions the world over—another advantage synthetic has over down is that it’s more breathable if you’re pushing hard—and its efficiency never fails to impress. Two internal dump pockets, in addition to the hand pockets, are a nice feature for vertically minded athletes.
Tips the scales at: 8.9 oz. (men’s), 7.6 oz. (women’s)
Insulation: 2 oz./ sq. yd. Climashield Apex
What it is: Thru-hiker favorite for warmth, weight, cost, and wet-weather performance.
What it isn’t: Good-looking or polished.
Like Zpacks, Enlightened Equipment is another small gear brand that’s held in high esteem by thru-hikers and gram-counters. Its synthetic Torrid jacket is one of the most impressive ultralight synthetic puffies in terms of thermal efficiency, putting its warmth almost on par with the Micro Puff for 1.6 ounces less. (Sure, that doesn’t sound like a lot, but the margins are where reputations are forged in the world of ultralight gear.) The Torrid’s sweet spot is minimalist backpacking trips where pack weight is critical, and it’s kept us warm in camp down to around 30 degrees with a fleece underneath, and even into the 20s while hiking.
The Torrid boasts the best price-to-performance ratio in the category, and is refreshingly affordable compared to every other ultralight puffy we’ve tested so far. You’ll pay for its bargain design in other ways, though, notably in its crinkly, less-than-premium aesthetic (which some of our testers have likened to a trash bag) and the lack of a stuff sack or packable pocket. But with an adjustable hem and hood and two hand pockets, its feature set is decent, solidifying its bona fides as a worthy ultralight synthetic midlayer. And while you’ll have to pay attention when it comes to its 10-denier nylon shell (7D in some colorways), that first rip will hurt a lot less than it would on a $375-and-up down puffy.
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