The Mammut Alyeska GTX Pro 3L jacket is one of the most bomber jackets we’ve reviewed. It’s also one of the most expensive, but it may just be worth it for a jacket like this. It has a 3L Gore-Tex Pro breathable waterproof membrane that will keep you dry in some serious weather. All seams are fully sealed with Gore tape and all zippers are YKK Vislon to enhance waterproofing and ensure no leaks. Gore-Tex Pro is also one of the most breathable fabrics on the market, and will do a great job of keeping you dry from the inside, when you’re hiking to your favorite stash. The Mammut Alyeska GTX Pro 3L also has pit vents with dual zippers helping you to control air flow in or out of the jacket. The Mammut Alyeska GTX Pro 3L has 4 front pockets including two chest and two hand warming. All of these pockets are accessible when wearing a pack and work great for backcountry adventures. The jacket also has a sleeve pass pocket for resort riding. The main zipper extends to the side of the neck. This provides the opportunity to add a neck gusset on the other side, allowing you to put on or take off the hood without having to unzip your jacket. I never think about how convenient this is, until I actually go to use it. The hood fits really well, and actually covers a good majority of my face when cinched down. This is great for really cold or windy days. The Mammut Alyeska GTX Pro 3L also has extra wide cuffs to fit over your gloves, and internal hand gaiters to keep them in place. The inside of the jacket is a polyamid material, but it feels relatively soft and comfortable. I’d rather have a fleece or flannel backer, but those materials also stick a bit more and are less breathable. Like the most high end technical shells, the Mammut Alyeska GTX Pro 3L has a detachable powder skirt, and jacket to pant interface. The Mammut Alyeska GTX Pro 3L has a regular fit that is pretty true to size. I was on the cusp of small or medium, but since the jacket offers a little bit of extra room I could wear the small and be fine. I like the jackets to fit a little bit more snug while still offering a bit of room for layering underneath. If I wanted even more room for layering or a more relaxed fit I could go up to the medium and that would work fine as well. Overall the jacket is pretty comfortable, and I never felt restricted. The length is on the longer side (which I love), but the waist doesn’t tend to balloon out like some other jackets. Overall, the Mammut Alyeska GTX Pro 3L is a pretty bomber jacket. It’s a great technical shell with a lot of great features. Sure it comes at a price, but I have found that sometimes it’s best to buy an expensive jacket once every 5 years than a cheap jacket once a year. You’ll be able to put the Mammut Alyeska GTX Pro 3L through the ringer and chances are very high that it will impress every time.
Jacket Size – S
Normal Specs– 5’10”, 160 lbs,
Upper Body– 34.5” Chest, Torso Length 23” (collar bone to pant button), Shoulder Width Approx 22”, Arm Length 18.5” (pit to wrist)
Lower Body– 30” Waist, 38” Hips, 30” Inseam, 22” Thigh
Turn On’s: Active fit jackets that fit well around my chest and torso, but don’t restrict movement. Size S Pants that have a bit more room in my thighs, that way I can actually use my pockets. And of course getting first chair with 12” of fresh powder on the mountain.
Turn Off’s: Size S Jackets that are too tight, and Size M jackets that are too loose in the waist. I really don’t like a loose waist that can allow cold air in, and I don’t like having to cinch down the waist. I also don’t like jackets that ride up when I’m skiing, The jacket should stay in place. Pants that fit too tight in the thigh, and I can’t use my pockets.