Stylish enough to wear on its own; warm enough to be your favorite layering piece.

Layer up for winter's cold with the Marmot Alpinist Half-Zip Long Underwear Top.
  • Heavyweight polyester fleece locks in warmth, and the grid (waffle) pattern helps wick away sweat so that you stay comfortable when you work up a sweat
  • Lycra cuffs feature integrated thumb holes so that the sleeves don't levitate up your arms when you hike, climb, or ski
  • Wind flap behind front zipper prevents drafts from chilling your core
  • Front chest pocket stores your keys, trail map, or afternoon snack

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Marmot Alpinist Half-Zip Long Underwear Top - Men's

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Here's what others have to say...

2 5


  • Familiarity: I returned this product before using it
  • Fit: True to size

I would caution those who are expecting something 'really' heavyweight. Compared to, say, a polartec power stretch - which I consider 'heavyweight' - this is no where near as thick/warm. I even asked the rep before buying and he said this shirt was almost like a light jacket. Unfortunately, not true. Seemed like a perfectly fine shirt - if that is what you were expecting - but I'm returning it because the description (both product and by the rep) led me to believe it is a LOT heavier than it actually is.

I wear small for Marmot ROM jacket, witch...

I wear small for Marmot ROM jacket, witch size should I take for for the Marmot Alpinist ?

Responded on

Hey Peter,

I am going to suggest staying with the same sizing even though the ROM is an athletic cut and this is only a regular. The biggest difference you will see between the two cuts is that the ROM will be a little trimmer in the body.

5 5

Light and warm...great for mild days

  • Familiarity: I've used it several times
  • Fit: True to size

I like the material, soft yet warm! Nice fit, close but comfortable for me, I got a medium as a 5ft 9, 155 lb guy.

5 5

Comfy Cozy with Features

  • Gender: Male
  • Familiarity: I've put it through the wringer

This is a warm comfortable fleece, that I really like. It's long enough in the back and arms. The thumb loops are a bonus, that you can use or not. The chest pocket took a little getting used to, but now I stash some cash in there. A good choice among the many base layers out there.

All size M parameters fit my physique...

All size M parameters fit my physique perfectly except chest circumference. I'm 2" bigger. Do you think I should get M size and will it stretch comfortably? I'm afraid that if I get L it will be too long.

Thank you.

Responded on

Get a large. The alpinist half zip has a very athletic cut and may be far too tight. I am usually a small in marmot products but I own a medium in the half zip. Much more comfortable.

Responded on

Thank you! I was just afraid that L will be too long. Is your M length (sleeves and body) OK considering that you wear S?

Responded on

The sleeve length is fine. The sleeves are a little longer due to the thumb holes. The piece overall is a little shorter so it may be a touch long but it doesn't bother me.

4 5

A Colorado Essential

  • Gender: Male
  • Familiarity: I've used it several times

This is a very warm and light weight fleece. I plan on wearing this fleece on cold winter days and as a base layer under my ski jacket. I pair this fleece with my Marmot Rom jacket for a nice little combo to climb in. The thumb holes are very useful to help prevent the sleeves from riding up when climbing or skiing. I ordered the small and the sleeves are a great length but I with the waist was a tad bit longer. Over all I am very pleased with this fleece.

Responded on

can you tell me your measurements because I'm trying to determine size for me. You said you got S, how tall/chest circumference are you?
Thank you!

5 5


Kick A$$ fleece. I wear it all the time for just about everything. Excellent fit and nice wind taping on the Napoleon pocket zipper.