An ideal athletic fit to the Atlas top makes this a baselayer with little equal. With Merino's ability to wick moisture, breathe, and keep you comfortable in a variety of warm and cold weather--all without the funk of traditional synthetic baselayers, there's just no reason not to wear an Icebreaker top.

The Icebreaker Men's 150 Crewe is a 150 gram Merino wool long sleeve crew. A small amount of Lycra gives this warm crewe a close, comfortable fit. The Men's 150 Crewe is perfect as a stand alone piece or a warm inner layer. If you haven't tried Merino Wool - trust us - you'll love the way it feels. Fits close to body.

The Icebreaker Men's Oasis Crew longsleeve shirt is a 200 weight Merino crew. A go to layering option, the Men's Oasis Crew feels great on your skin, it's odor resistant and small details - like flatlock seams - make it comfortable for when you're carrying a heavy pack. Slim fit.

The Icebreaker Men's 260 Crewe is a great do-everything piece. Featuring all the best properties of Merino Wool, the Men's 260 Crewe is odor resistant, fast drying and has a great next-to-skin feel - that's right NO ITCH. A close fit and non-chaffing flatlock stiching make this a great winter travel piece. Fits close to the body.

There's a reason that Icebreaker's Bodyfit 260 Long Sleeve is a best-selling classic year after year. The 200 weight 100% Pure Merino is light enough to be worn alone on long haul runs or during fluid full day climbing ascents. But it's equally adept as a heavier baselayer in colder conditions. With a close to body fit, the Icebreaker Bodyfit 260 Crew is a long sleeve dream shirt for any man.