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  • Merino wool wicks away moisture, dries quickly, breathes to regulate temperature and resists odors naturally
  • Fabric offers protection from UV light with a rating of UPF 50+
  • Raglan sleeve construction allows unhindered shoulder movement and flatlock seams reduce chafing
  • The men's Icebreaker Everyday Crew long underwear top has a slim fit
  • Machine washable; line dry or dry flat in shade


View all Icebreaker Men's Long Underwear Tops

REI membership


Best Use Multisport
Shirt Style Crew
Fabric Merino wool
Sun-Protective Fabric Yes
UPF Rating 50
Moisture Wicking Yes
Quick Drying Yes
Underwear Weight Lightweight
Sleeve Length Long Sleeve
Gender Men's

Size chart

Sizing notes

Measurements are stated in inches unless otherwise indicated. CHOOSING THE RIGHT SIZE: If your body measurements are midway between two sizes, select the smaller size for a tighter fit or the larger size for a looser fit. If your body measurements result in different sizes, we recommend using your chest measurement for tops and your hip measurement for pants.

Rated 5 out of 5 by from This shirt survived everyday trades job in Canada Use this during the cool months in southwest Ontario, Canada everyday. I work a trades job and go from cold environments to crazy hot in the same day while working intensly. Yet! these underlayers feel warm, but don't cause me to overheat either. I feel this is a crazy true test of these garments. In addition, since these would be kind of pricey to have a whole weeks set of... So I've been wearing it daily. Once in a while sweating a fair amount in them. Now, I don't normally stink up my clothing, and it all keeps pretty good. BUT! It took 3 weeks!! of daily wear to get just a slight odor This product performs way above my expectations, love it!
Date published: 2014-09-10
Rated 5 out of 5 by from Great! Amazing warmth for the weight! I was looking for something like this in Canada for quite some time but ran into constant disappointment. Craftsmanship, material quality, and versatility are unprecedented. I have to mention I am glad that this company is taking care of its own. The farmers all the way to the shippers are all considered. In knowing that this care has been taken to create a great product in today's wasteful/ harmful climate is refreshing. *slow clap*
Date published: 2012-01-12
Rated 5 out of 5 by from Great Value When shopping for a new base layer prior to a recent ski trip, I recently was debating whether I would need to spring for the more expensive smart wool, or if this more affordable option would be as good. While my skiing is admittedly in a more mild climate (New Mexico, with average day time temperatures in the teens or 20s), this lived up to my expectations: it kept me warm and dry. Beyond that, it was long enough that it didn't come untucked from my pants throughout the day. Final bonus, was that I accidentally threw this in the dryer after washing and it didn't seem to shrink or be impacted in any way, which was a welcome surprise!
Date published: 2016-01-25
Rated 2 out of 5 by from did IceBreaker change the fabric or weave? I own more than 10 icebreaker products including 6 LS Crew tops. I just bought this and was really surprised that it felt and wore totally different than all of the other LS crew tops I've ever bought before (last year and prior). The fabric seems looser and thinner on this. Between the fingers it feels flimsy, not substantial even though it is supposed to be 200. Maybe it is the weave, spin or the quality of the wool I don't know but it also wears loose, like a cheap cotton t-shirt. It doesn't 'snap' back when pinched away from the skin so it doesn't give the same warmth and 'glove' feeling when worn. Also, it is way too long reaching past the belt into the thigh area. Someone got the bright idea to take a product that was perfect and mess about with it. The result is an unhappy customer. :(
Date published: 2014-12-09
Rated 5 out of 5 by from amazingly warm Because of the frigid temperatures in the Midwest, I decided to try Ice Breaker after seeing one of those annoying ads that pop up everywhere on the internet. I am so glad that I did. I hesitated to buy the small, ordered a medium and then returned it to my local Ice Breaker "boutique" for the small. I wore it under a loose fitting sweater with my down coat to go out and walk the dog. He and I are not speedy walkers so I tend to be cold while walking him. Not only wasn't I cold ( it was about 20 degrees but I was actually a bit too warm... For a non-mountain climber, who likes to be warm without wearing 3 layers, this is the perfect layer...
Date published: 2016-12-22
Rated 2 out of 5 by from Less deluxe than in past. We got these shirts in the past, and they've been perfect in all ways: fit, warmth, quality, softness, durability. But this last one we ordered is thinner than the last (we ordered the same weight), and it's just not as soft. It almost feels like a synthetic mix, even though it's not. Looks nice, but it's a little dissapointing this time.
Date published: 2014-01-30
Rated 5 out of 5 by from all-weather comfort I love to wear icebreaker Tee-shirts year-round: they don't get sweaty in summer and they're comfortable in winter , when I prefer the long sleeves. One caution: this raglan-sleeve model fits more snugly than the inset-sleeve tees, so it needs to be one size larger if you want it for casual outer-wear.
Date published: 2014-11-28
Rated 5 out of 5 by from Great for colder days / evenings-totally versatil Icebreaker are quality in everything they do. I live in SoCal and I wear this when it's cooler during the day or at night. When it's warm I wear a black Tech T-lite. I'm quite an athletic build (6"2, 205lbs and lean) and the medium size fits perfectly with room to grow.
Date published: 2014-09-08
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