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Eisfeld Advanced SO Pant - Men's

3.75 out of 5 stars
4 Reviews


Size Chart


Eisfeld Advanced SO Pant

Quick ascents on fair-weather days require equipment that's lightweight and frill-free. You're not messing around with any stormy weather, you just want performance. The Men's Mammut Eisfeld Advanced SO Pant provides durable, minimalist mobility through glacier trek and technical climb alike. Constructed from highly elastic material, these softshell pants let your legs breathe on the fast approach while remaining durable enough for the rock face you're conquering.


  • Light softshell suitable for mountain tours and alpine climbs
  • Softshell material is highly elastic, breathable, and durable
  • Wide waistband adjustment is compatible with harnesses and backpacks
  • Reinforced seam edges and crampon protection with Dyneema
  • Stowable attachment hood to secure over mountaineering boots
  • Leg hem with gusseted zipper and anti-slip webbing ensures secure coverage
  • Item #MAMU55E
[face fabric] 93% nylon, 7% spandex [lining] 100% polyester
not sealed
[size 50] 32in
Leg Opening
gusset, zipper, anti-slip webbing
1 map, 2 zippered front, 1 phone
adjustable, tightlock button
Claimed Weight
1lb 1oz
Manufacturer Warranty
2 years

Overall Rating

4 based on 4 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 2 reviews
4 Stars - 1 reviews
5 Stars - 1 reviews

Fits Small

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Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

November 17, 2023


I've used it several times

Used for ice skating &cross country skiing in Alaska. Form-fitting but comfortable. Pares well with thin base-layer.

Brad B
3 out of 5 stars

November 14, 2022

Run small. Color is blue; not black.

I returned this product before using it
Size Bought:

I ordered size 30 since the sizing chart says 30.7" - 31.9" waist and I'm a 31" waist. These arrived and they are much too small even when wearing no base layer like I always would when wearing them and that was with the waist adjusted to the largest setting. Also, I'm slim and even this athletic fit was much too thin through the legs. Order at least one size up. A 32" might be right for me, but I won't be reordering due to the following color issue. These are offered in colors "Azurit" (a bright blue) and "Night" which appears to be black on the website. I ordered "Night" and they are a dark blue rather than black. I would not have ordered them if I'd known they were not black. Backcountry could help avoid returns if they stated a descriptive color to go along with the manufacturers color. In this case, something like: Night (dark blue). I'll be returning these, unfortunately. Even though I really love the stretch material and other features and one or two sizes up might fit right, they are not the color I want so I will be returning and not reordering.

Chadx C
4 out of 5 stars

October 2, 2022

Winter Mountaineering Approved

I've used it several times
Size Bought:

Took them to Mt. Aoraki and Tasman in New Zealand’s winter conditions. Pros: It was so cold and the snow was so deep… these pants handled everything well. Sturdy, didn’t get wet or even damp. Warm and comfy. Compatible with your boots and crampons. Waist runs high which you want and protects you from backpack chafing. Only two cons…. Well they’re pretty expensive. And a little heavier. Most importantly: they look really good, you’ll look smart

Jose J
3 out of 5 stars

April 9, 2022

You Can Do Better for Less

I've used it once or twice and have initial impressions
Size Bought:
38 Reg.
6' 1"

I was warned to go a size higher (32x32 my size). I went up twice to a 36x32. These are a European slim fit cut. More flash than brawn and just feels down right cheap for the price. This item is more for a very young man sporting a man bun !!