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Taiss Light Mid GTX Mountaineering Boot - Men's

4.166666666666667 out of 5 stars
6 Reviews
Current price: $299.25 Original price: $399.00
25% off


Size Chart


Why We Like The Taiss Light Mid GTX Mountaineering Boot

The Taiss Light Mid GTX Mountaineering Boot is a lighter mountaineering boot from Mammut, and it still provides us with rugged protection from any condition, whether we're climbing rock, ice, or snow. GORE-TEX Performance Comfort offers burly waterproof protection as well as performance-oriented breathability for hoofing it up the mountain. The upper is composed of Schoeller's stretchy, breathable softshell material, and Mammut's Georganic 3D technology fits the upper precisely to the contours of your foot shape. Underfoot, the Taiss features Vibram's Ascension Litebase sole for reliable traction on various terrain, including crampon compatibility.


  • Lightweight mountaineering boot built for rock, ice, and snow
  • GORE-TEX Performance Comfort for waterproof, breathable protection
  • Schoeller softshell upper with Georganic 3D tech for a solid fit
  • Vibram Ascension Litebase sole has large rubber lugs for traction
  • Runs small, so we recommend sizing up for ideal fit
  • Item #MAM01C8
Upper Material
Schoeller, microfiber, ripstop, mesh
GORE-TEX performance comfort footwear
2-zone lacing
mountaineeringTech, board
PU wedge
Vibram Ascension Litebase
single boot
Crampon Compatibility
Claimed Weight
1lb 1oz
Manufacturer Warranty
2 years
backpacking, mountaineering

Overall Rating

4 based on 6 ratings

Review Summary

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

Fits Slightly 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


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2 out of 5 stars

July 30, 2023

Too asymmetric for my feet.

I've used it several times

I really, really, really wanted to like this boot. They look fabulous and are incredibly light, though 3.9 oz heavier than advertised (1 lb 4.9 oz per side for a men's size 9). I purchased them to replace my mountaineering boots that weigh even more -- a full 5 ounces heavier on each side. They provide good support around the ankle, torsional stability, and have soles stiff enough for kicking steps in snow and using semi-automatic crampons. They felt fine walking around the neighborhood and the light weight did quicken my pace considerably. However, when I took them in the mountains for a steep day hike and a mountaineering scramble, there were two major problems with the fit on my feet that cannot be fixed. First, look carefully at the top view of the product photo. The shoe is VERY asymmetrical in design. While my other boots are asymmetrical too, and my crampons use the asymmetrical linking bars, these boots were just too curved inwards towards the big toe. It made for a lot of room in the big toe, which is good for me having had bunion surgery. But the curvature ended up cramming my pinkie and 4th toe into the right side of the shoe. This was super uncomfortable on downclimbs. Second, the position of the lace hooks at the top of the foot was, in my opinion, too high and forward to keep my heels held down well, and I ended up with a bad heel blister both times I used them outdoors. If these corner lace hooks had been positioned 1/4 to 1/2 inch further down and back, this would not have been a problem. I tried to "fix" these problems by changing the lacing patterns, not even using the laces down by the toe to let the shoe expand outward where my toes jammed, and double lacing around the top of the foot to keep the heels down. I kept hoping the shoe would loosen up to alleviate the toe jamming problem. But these aren't like old leather climbing boots that will eventually conform to your foot. The modern rubber and synthetic construction will only soften a little bit. I believe I purchased the correct size; the problem for me was that my foot just wasn't the same shape as the very asymmetric last of the shoe. I realized that if I purchased an even larger size, it would alleviate the toe jamming but the heel lift would get worse. I make my purchases carefully and don't like to return things, but unfortunately, this product just won't work for me.

Gary Y

Originally reviewed on Backcountry.com

5 out of 5 stars

January 20, 2023

Loving them so far

I've used it several times

I've used these boots a couple times since receiving them and am blown away! They indeed are mountaineering boots -- they're VERY stiff........and yet, they're completely comfortable to hike and even trail run in. The first time I wore them, they were a little hard on my right ankle bone, and each time thereafter they felt like super soft, comfortable, wrap around the foot and ankle hiking boots. The waterproofing thusfar has been great -- I can stand in a stream, hike through puddle that go over the top of the foot, and my feet stay warm and dry. They have great traction in snow and rocky, rooty technical terrain; in wet mud/on wet non-technical trails, the solid toe piece of the sole seems to slip -- I've remedied this by walking on the outer part of the foot/boot in such sections and I can see how this solid toe piece might be good for smearing, kicking in, etc.........and the boots look great! Kind of like Batman boots -- Very technical, stealthy and cool.

iascend i

Originally reviewed on Backcountry.com

4 out of 5 stars

February 3, 2022

Runs Small

I returned this product before using it

As some others have noted, I found that these run small. I ordered a size US 12.5 (EU 46.5) which I wear in some other brands, and immediately knew they were much too short for me. I don't know if Mammut's size US 13 would work or not. If they had one, I'd like to try it, but even that might be too small, based on what I'm seeing with the US 12.5. For the little I am able to walk in it inside (can only fit my foot in if I only wear only a thin liner sock) it does have ankle support, and lateral stiffness that suggests it would do well on slope traverses. This seems rare in boots this light, so I like that. It appears to be a promising boot. Wish they had my size.

Kevin T

Originally reviewed on Backcountry.com

5 out of 5 stars

September 13, 2021

Not the choice if you have wide feet

I've used it several times

I don't have experience with technical climbing in these; however have put 70 miles on them in the Brooks Range of Alaska. They handled clumping snow and rain very well, the tread is easy to knock snow out against rocks. The tread performs so well even if wet, still need spikes for walking on glacial ice, I was skipping rock to rock across rivers seamlessly at pace too. The boots are warm even while damp at the cuff. I really like the material on the cuff. The toe box is just wide enough for my feet but any wider would be uncomfortable, the heel is snug. I love how low the laces go down too, you can really get a customizable fit around the toes and ankle.

user image
Ryan B

Originally reviewed on Backcountry.com

5 out of 5 stars

June 24, 2021

Killer alpine boot

I've put it through the wringer

I've used this boot on technical rock, snow and glacier routes and love them. The fit is great with a snug heal pocket and just wide enough toe box. The flex allows for a natural walk but is stiff enough for technical climbing as well. It is warm for its weight and remains dry in even the wettest conditions

Steve B

Originally reviewed on Backcountry.com

4 out of 5 stars

May 8, 2020

Almost Perfect

I returned this product before using it

This boot runs just a bit on the small size. I ordered my normal size 10 along with two other boot brands. This boot was small. Will return for a 10.5. The boot is well constructed and comfortable. I recommend but consider a 1/2 size up.

lori I

Originally reviewed on Backcountry.com