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A necessity for extending stays in the high alpine.


  • Polkatex DWR coating repels light moisture and precipitation outside

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MontBell Ultralight Down Pant - Men's

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Here's what others have to say...

5 5

Astronaut pants!

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

Oh... I love this! Crazy warm and comfortable!

5 5

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.

5 5

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.

Responded on

I don't know if you're familiar with Tai Chi, but I call you last sentence "White Crane Changes Pants in the Mud".

5 5

exactly what I wanted

  • 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.

4 5

U L insulation pant

  • Fit: True to size


How do these pants compare to the Mountain...

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

Responded on

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.

5 5

Great bag liner!

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


2 5

They're light alright

  • Familiarity: I returned this product before using it


Responded on

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!

5 5

Look nice so far, prior using them a ton

  • Familiarity: I've used it several times



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 Responded on

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:


4 5

Great pants

  • Familiarity: I've put it through the wringer


Responded on

Hello Knanier,

If you look these pants do have elastic which can be pulled tight and tied off at the ankles.

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?

4 5

great extra layer

  • Gender: Male
  • Familiarity: I've put it through the wringer


what kind of tempuratures can there pants...

what kind of tempuratures can there pants withstand

Responded on

These pants can be part of a system that can take you well below freezing. The other components of the system are just as important, though, so it's hard to answer your question directly.

MontBell Ultralight vs Western Mountaineering Flash Pant

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.

Responded on

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... :)