The Highest Warmth-to-Weight Ratio Ultralight Down Pants For Backpacking
When freezing temps are expected, you should pack a pair of the best down pants for backpacking. Ultralight down pants are oft overlooked, and the warmth they contribute cannot be replicated by fleece or merino. You are only as comfortable as your coldest body part, and you will be much happier with toasty legs.
This is a data-informed buyer’s guide! Our ultimate truth for assessing the performance of down pants is the “Uncompressed Down Volume Per Ounce of Total Garment Weight” statistic. This measurement allows us to compare the relative warmth-to-weight ratio of two pairs of pants, and it is derived by multiplying fill power times fill weight, divided by total garment weight. It quantifies how effectively each pair is using its mass to insulate.
You may also be interested in our guide to merino leggings, down jackets, down parkas, down vests, synthetic puffy jackets, down booties, and fleece pants.
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Quick Picks For Ultralight Puffy Pants
Ultralight Down Pants
- Best Buy, Best Value: Enlightened Equipment Torrid (not down)
- Top Performer: Cumulus Basic Down Pants
- Top Performer: Montbell Light Down Pants
- Top Performer: Western Mountaineering Flash Pants
- Best Seller: Mountain Hardwear Ghost Whisperer Pants
- Most Durable: Kuiu Super Down LT Puffer Pants
- Best for Ski Touring: Stellar Equipment UL 2.0
Winter-Weight Down Pants
- Best Full-Zip: Feathered Friends Helios Pants
- Best Warmth-to-Weight: Rab Argon Pants
- Best On Snow: Western Mountaineering Flight Pants
- Best Expedition-Grade: Feathered Friends Volant Pants
Custom Ultralight Down Pants
- Alan’s Pick: GooseFeet Gear Custom Down Pants
Comparison Table
Mobile users rotate device for full-width table
| Model | Price ($) | Weight (oz) | Fill Power (in³/oz) | Fill Weight (oz) | Down Volume (in³) |
Down Volume / Garment Weight (in³/oz)
|
| MH Ghost Whisperer | 295 | 9.0 | 800 | 2.2 | 1760 | 195 |
| Kuiu Super Down LT | 269 | 8.3 | 850 | 1.9 | 1615 | 195 |
| Stellar UL 2.0 | 299 | 7.6 | 850 | 2.1 | 1785 | 234 |
| Western Mountaineering Flash | 325 | 6.5 | 850 | 2.0 | 1700 | 261 |
| Western Mountaineering Flight | 375 | 12.5 | 850 | 4.0 | 3400 | 272 |
| Feathered Friends Volant | 349 | 17.0 | 900 | 5.6 | 5040 | 296 |
| Feathered Friends Helios | 289 | 13.0 | 900 | 4.4 | 3960 | 304 |
| Montbell Light Down Pants | 230 | 6.8 | 800 | 2.8 | 2240 | 315 |
| Rab Argon Pants | 220 | 13.2 | 800 | 5.6 | 4480 | 339 |
| Cumulus Basic | 275* | 7.2 | 850 | 3.6 | 3060 | 425 |
| Enlightened Equipment Torrid | 140 | 6.2 | n/a | n/a | n/a | n/a |
* MSRP of $205. We estimate $260 after tariffs and delivery fees
Ultralight Down Pants
Enlightened Equipment Torrid
Choose the Enlightened Equipment Torrid Pants, despite not being down insulated, because they’re lighter and more affordable than all but the very best ultralight down pants. Rather than down, they’re insulated with Climashield APEX synthetic batting, which handles moisture better and dries faster, a valuable characteristic for pants. The 10d shell gets an elastic drawstring chinch at the waist. Drawbacks to Torrid are that premium down still outperforms synthetic in terms of warmth-to-weight ratio and compressibility, and they should have a higher rise waist.
- Price: $140
- Weight: 6.2 oz
- Fabric: 10D Nylon
- Insulation: ClimaShield Apex
- Pros: Ultralight. Top tier synthetic insulation. High warmth-to-weight. Great value. Dries quickly. Warm when wet.
- Cons: Less compressible than down. Lower rise waist than is ideal.
Mountain Hardwear Ghost Whisperer
Pull on the Mountain Hardwear Ghost Whisperer pants because they’re the best selling ultralight down pants on the market, widely available (AKA usually on sale somewhere) and trusted by many. Features include ankle zips and hand pockets; rare but nice to have! That being said, they’re a bit overcosted and underfilled, so optimizers will want to look elsewhere.
- Price: $295
- Weight: 9.0 oz
- Fabric: 15D Nylon
- Fill Power: 800 | Fill Weight: 2.2
- Percent Down Weight: 24%
- Uncompressed Down Volume: 1760
- Down Volume/Jacket Weight: 196 in3/oz
- Pros: Ultralight. Widely available. Hand pockets. Recycled fabric. Good looking.
- Cons: Modest warmth-to-weight. Ankle zips add weight and cost.
Western Mountaineering Flash
Western mountaineering Flash Pants are the original ultralight down pants, popularized for their sub-7-ounce weight and premium make up. Features include an adjustable belt, elastic ankle closures, and a reinforced seat fabric to prevent tears and snags. That being said, they’re quite expensive and slightly underfilled; better suited to freezing temps than well below.
- Price: $325
- Weight: 6.5 oz
- Fabric: 10D* nylon ripstop (*estimate)
- Fill Power: 850 | Fill Weight: 2.0 oz
- Percent Down Weight: 31%
- Uncompressed Down Volume: 1700 in3
- Down Volume/Jacket Weight: 261 in3/oz
- Pros: Ultralight. High warmth-to-weight ratio. Reinforced seat.
- Cons: Lower total warmth than average down pants. Expensive.
Cumulus Basic Down Pants
Choose the Cumulus Basic Down Pants because they have the best warmth-to-weight stats of any model in our guide. Literally 50% of their total weight is 850 fill power down. The drawback is that ordering them to America from Poland is a slow process snarled by tariffs and courier fees. The 7D fabric is also a bit lower durability than we prefer with pants.
- Price: $275 (our estimate after fees) $205 MSRP
- Weight: 7.2 oz
- Fabric: 7D Pertex Quantum nylon ripstop
- Fill Power: 850 | Fill Weight: 3.6 oz
- Percent Down Weight: 50%
- Uncompressed Down Volume: 3060 in³
- Down Volume/Jacket Weight: 425 in³/oz
- Pros: Ultralight. Highest warmth-to-weight ratio. Generously filled. Great stats. Ultralight fabric.
- Cons: Tariffs and courier fee-upon-delivery. Delicate fabric. Slow shipping.
Montbell Light Down Pants
Montbell Lights are an excellent pair of ultralight down pants by virtually every measurement. They are lighter, warmer, and less expensive than average. This pair is featureless apart from the drawcord waistband. Drawback to this design is the stitching pattern which creates more cold spots. Fewer stitches equals more warmth.
- Price: $230
- Weight: 6.8 oz
- Fabric: 10D nylon ripstop
- Fill Power: 800 | Fill Weight: 2.8 oz
- Percent Down Weight: 42.3%
- Uncompressed Down Volume: 2400 in³
- Down Volume/Jacket Weight: 338 in³/oz
- Pros: Ultralight. High warmth-to-weight ratio. Generously filled. Great stats.
- Cons: Excess stitches create more cold spots.
Kuiu Super Down LT
Choose Kuiu Super Down LT for their full side zippers, which allows for quick and easy on/off without removing shoes. This pair is designed by a hunting brand, so you’re getting better than average durability. We also appreciate the hand pockets and Velcro waist adjuster. That being said, they’re underfilled and less warm than most other pairs.
- Price: $269
- Weight: 8.3 oz
- Fabric: Toray® Nylon Ripstop – 29 g/m² (denier not listed)
- Fill Power: 850 | Fill Weight: 1.9 oz
- Percent Down Weight: 23%
- Uncompressed Down Volume: 1615 in³
- Down Volume/Jacket Weight: 195 in³/oz
- Pros: Lightweight. Hand pockets. Full length side zippers. Windproof. Good durability.
- Cons: Underfilled baffles are less warm than average, lower warmth-to-weight than peer group. Men’s fit only.
Stellar Equipment Ultralight Down Pants 2.0
For pair of ultralight down pants designed for on-the-go use, and especially for backcountry skiers, check out the Stellar Equipment ULs. This pair is cuts off mid calf for a better boot interface, and easier on/off. They also feature full length side zippers, and side stretch panels to make walking easier. However, all of these movement friendly features makes them worse for static use at camp, so just make sure you know why you’re choosing them.
- Price: $299
- Weight: 7.6 oz
- Fabric: Toray® Nylon Ripstop – 29 g/m² (denier not listed)
- Fill Power: 850 | Fill Weight: 2.1 oz
- Percent Down Weight: 28%
- Uncompressed Down Volume: 1785 in³
- Down Volume/Jacket Weight: 234 in³/oz
- Pros: Ultralight. Full side zippers. Calf length accomodates ski boots and makes for easier in/out. Great for daytime use.
- Cons: Warmth gap at ankle to mid calf. Not the best option for static use at camp.
Best Down Pants For Winter Backpacking
Feathered Friends Helios
Choose the Feathered Friends Helios for a mega warm pair of lightweight, winter-grade down pants that feature a full-length side zipper, high fill power down, and reasonably durable 20d Pertex Endurance. Drawbacks to this design are that the side snaps on the waistband are known to pop open; and like all models this warm, are bulky and somewhat difficult to pack.
- Price: $289
- Weight: 13 oz
- Fabric: 20D Pertex Endurance LT Nylon
- Fill Power: 900 | Fill Weight: 4.4 oz
- Percent Down Weight: 34%
- Uncompressed Down Volume: 3960 in³
- Down Volume/Garment Weight: 305 in3/oz
- Pros: Incredibly warm. Lightweight. High warmth-to-weight. Full length side zippers for venting and easy on/off. Sustainable fabrics.
- Cons: Bulky to pack. Midweight No pockets. Snaps can come undone.
Rab Argon
Choose the Rab Argon for a preposterously warm pair of lightweight down pants, at a very reasonable price. They’re filled with 5.6 oz of 800 fill power down, comparable to many expedition weight pants. This is the warmth-to-weight ratio beast of the winter-grade category. Apart from the sheer bulk of that much down, other drawbacks include lack of side zips (usually desirable for winterized models) and the lack of a women’s fit.
- Price: $220
- Weight: 13.2 oz
- Fabric: 20D Pertex Microlight Nylon
- Fill Power: 800 | Fill Weight: 5.6
- Percent Down Weight: 42%
- Uncompressed Down Volume: 4480 in3
- Down Volume/Jacket Weight: 339 in3/oz
- Pros: Preposterously warm. High warmth-to-weight ratio. Good durability. Great value.
- Cons: Bulky to pack. Midweight. No Pockets. Not ultralight. No side zippers.
Western Mountaineering Flight
The Western Mountaineering Flight combine critically placed waterproof fabric with winter-weight insulation to achieve snow camping perfection. Specifically, Gore Windstopper is added to the seat, and front-of-knees-to-ankle zone to reduce moisture build up as you kneel or sit on snow. They also feature full-length side zips for easy on off, and nice elastic cuffs. Drawbacks are the high price tag, and fact that they have a smidge less fill weight than others in the winter category.
- Price: $310
- Weight: 12.5 oz
- Fabric: 20d nylon ripstop, WINDSTOPPER knees & seat
- Fill Power: 850 | Fill Weight: 4.0 oz
- Percent Down Weight: 32%
- Uncompressed Down Volume: 3400 in³
- Down Volume/Jacket Weight: 272 in³/oz
- Pros: Waterproof knees/seat makes snow camping easier. Warm. Full-zip sides.
- Cons: Expensive. Least warm in mid-weight category.
Feathered Friends Volant
The Feathered Friends Volant are an expedition-grade pair, featuring waterproof durable shell fabric, and oodles of high fill power down; a great pair for snow camping in extreme cold. They feature box baffle construction to eliminate cold spots, and full length side zips for easy on/off. You’ll know if you need this pair, but the obvious drawback is that the design is overkill for most backpacking scenarios.
- Price: $349
- Weight: 17.0 oz
- Fabric: 30d Pertex Shield XT Waterproof/breathable
- Fill Power: 900| Fill Weight: 5.6 oz
- Percent Down Weight: 33%
- Uncompressed Down Volume: 5040 in³
- Down Volume/Jacket Weight: 297 in³/oz
- Pros: Waterproof knees/seat makes snow camping easier. Durable. Warmest. Full-zip sides. Fully baffled.
- Cons: Bulky. Heavy. Expensive.
The Custom Ultralight Option
GooseFeet Gear Custom
Adventure Alan himself prefers the GooseFeet Gear Custom Down Pants. From an ultralight connoisseur’s perspective, this is where you’ll find the highest warmth-to-weight ratio if you’re willing to place a custom order and wait for the five week lead time. Here are all of the customizable elements and some ideas for how to configure them.
- Shell/Lining Fabric color and 20d or 8d
- Ultralight backpackers should choose 8d
- Everyone else should choose 20d
- Baffles Vs Sewn Through
- Sewn through for use above 10F
- Baffled for use 10F & below (adds shell weight, decreases cold spots)
- Zippers: Every possible configuration
- No zippers for standard cold weather hiking and backpacking
- Full side zips for use with snow boots, crampons, ski boots, snowshoes, etc
- Down fill weight ranging from 2.5 oz – 8.5 oz. Temp ratings via GooseFeet Gear
- 3.5 oz of down fill for use in 30F and above
- 4.5 oz of down fill for use in 20F
- 5.5 oz of down fill for use in 10F
- 6.5 oz of down fill for use in 0F and below
- Waist, hips, inseam, thigh/calf girth
- Based on your body measurements
One potentially nifty customization is to get down capris. These should be cut to drape to your lower-mid-calf instead of the ankle, and have a girthy opening. This configuration allows you to take them on/off over your shoes without resorting to zippers or having to de-shoe. Very useful! Pair with high top booties for full coverage/no gaps above the ankle.
Choosing the Right Amount of Puff
In addition to choosing whether or not to pack puffy pants in the first place, you will want to choose a pair with the proper amount of insulation relative to the expected temperatures. You don’t want to underpack and be cold, but overpacking adds excess weight and bulk, and can even cause you to get sweaty.
Based on our personal experience cross referenced with GooseFeet Gear’s temperature recommendations, we recommend considering puffy pants whenever you expect evening temps below 40F. When you expect temps in the 30-40F range, choose a pair with 2-3 oz of down fill. When you expect temps in the 20-30F range, choose a pair with 3.0-4.5 oz of down fill. When you expect temps below 20F, choose a pair with at 4.5+ oz of down fill. Scale up the colder it gets.
Ultralight down pants conclusion
Thank you for reading our guide to ultralight down pants and backpacking and winter camping. Here you will find all of the best models available, and we know any one of them would serve you well. If you’ve never owned puffy pants before, you’re in for a life changing backcountry upgrade this season. Happy camping!
