Tests‎ > ‎Clothing‎ > ‎

Mammut - Segnas Jacket

posted Sep 20, 2013, 8:25 AM by GoOut Project   [ updated Mar 13, 2014, 12:31 AM ]

The Mammut Segnas Jacket is a Hard Shell thought for all those outdoor/mountain activities where lightness and breathability are key factors. At Go Out Project we are always looking for new fabrics that offer the right balance between water resistance, breathability, and lightness and the new Gore-tex® Active looked promising in this regard. Therefore, we decided to try it with the Mammut Segnas Jacket.

Technical Description

The jacket is entirely constructed with a 3-layer laminate fabric with Gore-tex® Active membrane. The Segnas features:
  • Helmet-compatible hood adjustable in both horizontal and vertical direction
  • Sleeves with preformed elbows
  • Large chest pockets that also serve as ventilation
  • One-hand adjustable cords on the waist and hood
  • Adjustable cuffs with velcro
  • Waterproof zippers
Weight: 314 g (size M)
Material: Gore-Tex® Active 3-layers

Our Test 

We tested the Segnas for 4 months over spring/summer for skiing, trekking, alpinism, climbing, trail running, mountain biking
The weather conditions we encountered were extremely varied: from monsoon rains to heavy snow, from the icy winds of the glaciers to dry and clam sunny days.

First Impressions 

Considering that it is a Hard Shell, the Segnas is really not very "Hard"... amazingly, it is soft! Since the first moment you wear it, you realize how comfortable it really is compared to the typical "cardboard-feeling" of most waterproof jackets.

Cut & Fit

Overall, the cut is well-made. The form of the jacket couples well to the shapes of an athletic body and also when arms are raised the jacket stays in place. The hood is perfect! It fits very well both with and without a helmet and it never impedes the view. The raglan sleeves eliminate the presence of seams on the shoulders, very critical spots that are most subject to rub and wear when carrying a backpack. We have really appreciated the pre-shaped elbows in all the activities. Unfortunately, though, all of our testers have found that the sleeves are a bit too short (on average by 1-2 cm).


Breathability is good when compared to a classical Hard Shell. You typically need longer time to reach the point when the exchange of water vapor with the external environment becomes insufficient and you start sweating. During a hike of several hours in the pouring water of a furious monsoon rain, under extreme conditions of humidity, we still worn it with pleasure over a breathable baselayer. Goodbye old plastic bags! When left open, the large front pockets allow a rich exchange of air for extra ventilation.

Lightness & Packability

The fabric, in our opinion, is one of the best examples of balance between lightweight and durability. This has allowed our testers to use the Segnas for many types of activities. The jacket weighs only 314 g and it can be folded and packed into a very small volume, therefore making it the ideal extra garment to always carry with you in your backpack in case of sudden showers. 


The tear and wear resistance is good, especially if considering the weight of the garment. After months of use, the jacket still looked brand new! The DWR treatment, however, disappeared quite rapidly, already after the first few weeks it had vanished completely... a real shame!


Thanks to its lightweight, high packability, relatively good strength, and a great cut the Segnas can be used in many different outdoor activities and it is, indeed, a perfect allrounder great for many outdoor sports.

Our Verdict

The Segnas Jacket is the garment to wear in all those situations in which rain and wind leave no escape and, at the same time, intense physical effort is required. No matter if it's summer or winter, the Segnas is perfectly suited to a wide range of temperatures and thanks to its great packability and lightweight, it is the perfect companion of many outdoor adventures.

 Lightness 9/10
 Comfort 9/10
 Fit & Cut 6/10
 Weather Protection 9/10
 Breathability 8/10
 Versatility 9/10
 Durability 7/10
 Total Score 8.1/10

+ Good Breathability
+ Good lightness-to-thoughness ratio 
+ Great packability 

- Sleeves are too short 
- DWR treatment is not very long-lasting

 Italo B., Marco M., Marco C., Gabriele A.