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Eigerjoch Light IN Hooded Jacket - Men's

4.875 out of 5 stars
8 Reviews


Size Chart


Why We Like The Eigerjoch Light IN Hooded Jacket

Certain snow-capped peaks have always seemed just out of reach, but the Eigerjoch Light IN Hooded Jacket makes the journey seem doable. Its incredibly lightweight design is still warm enough for the most intense alpine missions thanks to PrimaLoft's innovative Cross Core technology, combining lofty synthetic fibers with Aerogel for increased thermal performance. Harness-friendly pockets and a helmet-compatible hood prepare us for climbing, skiing, or a combination of the two, and one pocket does double-duty as storage that compresses the jacket on warmer ascents.


  • Ultralight midlayer for alpine climbs and backcountry missions
  • Cordura ripstop provides lightweight and durable abrasion resistance
  • PFC-free water repellent coating repels falling flakes and raindrops
  • PrimaLoft Gold with Cross Core Aerogel for superior heat performance
  • Regular fit allows space for extra layers and comfortable movement
  • Helmet-compatible hood blends safety and warmth for best comfort
  • Zippered side pockets accessible while wearing a harness
  • Stowable design compresses to pack into its own pocket
  • Item #MAMU5CO
10 x 10D 100% Cordura nylon, PFC-free DWR coating
60g PrimaLoft Gold (90% recycled polyester), Cross Core Aerogel
Center Back Length
2 zippered hand (1 stowable)
Claimed Weight
climb, ski, snowboard
Manufacturer Warranty
2 years

Overall Rating

5 based on 8 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 1 reviews
5 Stars - 7 reviews

Fits Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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4 out of 5 stars

February 7, 2024

Light, warm jacket

This jacket provides remarkable warmth considering its weight. I've worn it comfortably in temperatures ranging from -7°C (19°F) to 15°C (60°F). However, it has one issue : when moving, perspiration may cause the interior to become damp. Nonetheless, I highly recommend it for those seeking lightweight travel options.

Nizar T

Originally reviewed on

5 out of 5 stars

January 3, 2024

Solid Mid Layer

The jacket is really warm for its thinness and exactly as advertised in terms of blocking the wind and being small to pack. I have come to like this brand more and more as I know have shells and mid layers. This will be a great multi use item for the fall and mid layer for the winter.

Matt H

Originally reviewed on

5 out of 5 stars

December 15, 2023

Warm & Incredibly Light

This jacket is incredibly light, you barely even notice that it's on. It fits true to size - I'm 6'0"/185lbs and the Large has just enough room to be comfortable - not constricting at all. I wore it over a T-shirt in mid-20 degree weather and didn't feel chilled. If you need a good underlayer for skiing/snowboarding or something to wear during the winter it's a good choice. The only thing I would note is that the "Night" color isn't gray as shown in the pics, it's more of a navy/dark blue and has a slightly iridescent sheen to it. Not a bad color at all, but don't expect it to match the images Mammut provides.

Originally reviewed on

5 out of 5 stars

May 30, 2023

Awesome Insulating layer.

The jacket is stupid light weight and warm. Use it for snowboarding and other winter activities under my hard shell.

Originally reviewed on

5 out of 5 stars

March 23, 2023

Amazing jacket for cold ice climbing days

I am skinny and tall (6'1" 150lb.) and the jacket size L fits perfectly. The sleeves allow free movement of hands while climbing and do not significantly pull the rim. The hood fits perfectly with and without a helmet. When I saw it the first time I thought it was not thick enough to keep me warm. I climbed in it in single digit temperatures and it performed just great.

Originally reviewed on

5 out of 5 stars

January 5, 2023

Perfect 40 degree jacket

This is a perfect jacket for hikes in 40-50 degree temps! I wear only a light base layer and this jacket.

Originally reviewed on

5 out of 5 stars

December 25, 2022

amazing jacket

Size Bought:
5' 10"

great jacket, but definitely runs husband usually would wear a Large and we will try the XL

Lynda D
5 out of 5 stars

May 27, 2022

Reviewing my MAMMUT Eigerjoch Light IN Hooded Jacket

I purchased my MAMMUT Eigerjoch Light IN Hooded Jacket this past winter to wear under my ski school uniform jacket. It is a great complement to my winter wardrobe as it is extremely light and warm. Now that Copper's winter season is over and I am playing in the backcountry, the Eigerjoch Light IN Hooded Jacket has a permanent place in my backpack for the ski down after skinning up. When you purchase the MAMMUT Eigerjoch Light IN Hooded Jacket you I hope you enjoy it as much as I do.

Jeff S

Originally reviewed on