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Round out your winter mountaineering kit with a down jacket and the six-and-a-half ounce Mont-Bell Ultralight Down Pant packed with 800-fill goose down. Montbell used highly-packable insulation and compressible shell material to craft these insulated pants, leaving you little reason to leave them behind when the weather hints at sub-arctic temperatures at night. Rather than carrying heavy fleece pants, or simply going without, treat your legs right, because after all, you're going to need them to get home.

  • 800-fill goose down means lightweight, highly-packable insulation that lofts easily after being pulled from your pack
  • Ballistic Airlight nylon shell means durability and packability without a weight penalty
  • Polkatex DWR coating repels light moisture and precipitation outside
  • Single-quilt construction reduces weight and stuffs easily into your pack or pocket
  • Reviews
  • Q & A

What do you think about this product?

Have questions about this product?

Ultralight, Ultrawarm

  • Familiarity:I've put it through the wringer
  • Fit:True to size

These are the perfect complement to an ultralight sleeping system. I carry these when temperatures will dip just below freezing to help extend my quilt at night, but also for wearing around camp or out shooting photos. Just be careful if you sit down on them, they are not particularly durable.

Fit is roomy enough to be able to pull them over a base layer or even hiking pants, but still trim enough to be efficient.

Make your friends jealous

  • Familiarity:I've put it through the wringer
  • Fit:True to size

I am really happy with these pants. I think most people don't even know down pants exist. Not only do they exist, but they will drastically improve the quality of your life in the winter -- and make your friends jealous.

I am 6'2"/170lbs and I got medium and they fit well and are long enough.

On Fall backpacking trips, I wear them over my pants in camp. This also lets me use a lighter sleeping bag by wearing a down jacket as well. At 6.5oz, they are very light and perfect when you are planning to be in camp for awhile, but not in your sleeping bag.

If I am going to be romping around in the snow, like building a quinzhee, I wear them under softshell pants (Arc'teryx Gamma LT) when it gets dark.

In town, I use them on really cold days (<0F) under normal pants, walking and waiting for the bus. Except for thicker legs, it looks pretty normal -- but much more comfortable.

So obviously, these pants are very warm. I would not wear them while doing any highly-aerobic activity. The only problem with these pants then are that you cannot put them on without taking your shoes off since there are no zippers at the bottom. This means you have to stop, sit down, take off your shoes (likely in the snow), and preciously put your down pants on without getting your socks wet.

exactly what I wanted

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size

I wanted a pair of down pants for sleeping on winter backpacking trips. These are perfect. They compress down to nothing. The coldest camp temperature I have used them is 17 deg. F. With only a light weight long-john bottom, they were plenty warm enough both for hut lounging, and sleeping under a down quilt. I will be taking them along for sleeping in my winter hammock system too. I have no doubt they will be sufficient to zero temperatures, saving pack volume and weight.

The waist fit is perfect, but, the length is a little long, but, not annoyingly so, I'm not complaining.

A pocket would be nice. It's one of the items I have paid full price for and am HAPPY that I did. If you want cold winter performance, these should do it for you.

U L insulation pant

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size

I needed something to wear for sleeping in sub freezing weather, in combination with a down quilt. Worn over the lightest long underwear bottoms, these Montbell U L pants are great, just what I wanted. Maximum warmth vs. low volume./weight. One of the very few items I'm willing to pay full price for.

Great bag liner!

  • Familiarity:I've used it several times
  • Fit:True to size

A great second layer in a sleeping bag to get added warmth. They have saved me the expense of purchasing a lower degree bag. Using these pants, a Patagonia down jacket, homemade down booties, and Neo-air mattress, I was able to get 15�more degrees out of my 35� Western Mountaineering Highlite bag . Incorporating these pants (as part of my ultralight pack) has also allowed extra/multiple uses as well. They are great for lounging around cold mornings prior to packing up. They fit well and pack small. I also keep them handy at home as they are great for getting the morning paper!!

They're light alright

  • Familiarity:I returned this product before using it

These pants may contain high quality down, but there sure isn't much of it. I can't imagine these providing any more warmth than a good pair of thermal underwear. There are two important metrics in evaluating a down garment. "Fill Power" is the quality of the down based on loft to weight ratio. The other number is "fill weight." This is the weight of down actually contained in the garment. MontBell does not provide this number, for reasons that are now obvious. I suspect this garment contains less than an ounce of down. Western Mountaineering provides both numbers in their specs. If you are looking for warm down pants, you should consider their Flash or Flight pants, available at

Montbell does provide the weight, just doesn't so don't blame the manufacturer for the retailers mistake (BC is pretty bad about accurate specs unfortunately. For example the WM Flash pants weigh 6.5oz, these actually weigh 7.7). Anyway, for general info these have 2.0oz of down inside them depending on size, same as the WM Flash, except 800fp instead of 850fp. Basically they're legging versions of the UL down jacket.

So you get around 300wt fleece warmth but at around half the weight. They aren't as puffy as the WM pants for sure, and heavier, but they are less expensive to compensate!

Look nice so far, prior using them a ton

  • Familiarity:I've used it several times

Just got these. Wanted down insulated pants for hunting in Michigan, and to pack up small on Colorado elk hunts. Haven't put these through the ringer yet, but they fit well, and seem to be made of decent quality. Can't really beat these for the price--most other down pants options are twice the cost of these or more. Not too baggy, but not too tight such that you can't fit a base layer and midweight layer underneath. They feel very light (in oz weight, not warmth), and they pack very nicely in the included drawstring stuff sack. I'd penalize a star or two ONLY IF these were priced much higher than $175 because these are relatively simply designed, they are not very technical, and corners were certainly cut in regards to quality (e.g., stitching); HOWEVER, for the price, they deserve all 5 stars for value upon first glance and trying them on. I will update this review after the hunting season, and perhaps also after this winter.

UPDATE> Wore them weekend of 11/23/2013, while hunting (sitting still for 4 hours) in 13 degree weather, and they kept my legs toasty!

Great pants

  • Familiarity:I've put it through the wringer

These are great for throwing on under a shell when its really cold, or for lounging around camp at the end of a day well spent. Super light and a great way to add some degrees to that shoulder season sleeping bag. Wish the had elastic at the ankles.

great extra layer

  • Familiarity:I've put it through the wringer

i wore these under bibs for months on end and they are a great extra layer. in super cold climates a little down goes a long way! they fit with a very high waist but helps to keep everything tucked in under gear.

MontBell Ultralight vs Western Mountaineering Flash Pant

Considering these pants are the same weight, it's surprising how much more loft you get with the WM Flash down pant. The only downside to the Flash is it has a REALLY high waistband.

MontBell Ultralight vs Western Mountaineering Flash Pant

Thanks for the pic, it speaks a thousand words! Don't get me wrong, I am a huge fan of MB (have a few of the parkas), but have been going back and forth between the MB ULDI pants and the WM Flash pants. This takes care of that...
However, now I am debating the WM Flash pants vs some of Ben from GooseFeet's down pants... :)

Will this product be available anytime soon?
Thanks Kevin

How do these pants compare to the Mountain...

How do these pants compare to the Mountain Hardwear Compressor pants?

The biggest difference that you may have noticed already is that the Montbell Ultralight Down Pant employs 800 fill down while the Compressor Pant uses MHW's proprietary Thermal Q synthetic insulation. Other differences include a slightly trimmer fit in the Montbell, the fact that the MHW has full length side zips and knee/seat reinforcement, and the fact that the MHW is nearly a full pound heavier in claimed weight.

Overall it is like the proverbial apples and oranges. Both are good pants but it all depends on how you want to use them and what features are most important to you. A better comparison would probably be between the MHW compressor and the Montbell Thermawrap, but I will leave that for another day.

So on the tech specs it says these pants...

So on the tech specs it says these pants have a lifetime warranty? Is this legit or not?

Best Answer

Hey Laurel,

You have to know the limitations. You trash them, it's not going to be covered under warranty.

Here's how Mont Bell sees it:

MontBell?s warranty covers all defects in materials and workmanship to the original owner for the lifetime of the product. If a product ever fails due to a manufacturing defect, MontBell will repair the product, or replace it, at our discretion. This warranty does not cover damage(s) caused by accident, improper care, negligence, alterations, or normal wear and tear. Damage(s) not covered under warranty will be repaired at a reasonable rate and a fee will be charged for shipping. All shipping to the MontBell Warranty Department must be pre-paid....

Unanswered Question

Hi there, I want to order a pair of Montbell...

Hi there, I want to order a pair of Montbell ultralight down pants and want to know what size will fit me. I have tried a pair of US medium TEC pants and also a pair of US small older-style sythetic fill pants which appear to be the same design as the ultra-light down pants. The former was way too big and the latter a wee bit too small.

Can you advise?



what kind of tempuratures can there pants...

what kind of tempuratures can there pants withstand