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The Smartwool Men's Merino 250 Base Layer 1/4 Zip has an updated fit to improve functionality while also enhancing aesthetics. As one of our heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature regulated as you enjoy high-intensity skiing, hiking, running, and more.

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An update on Icebreaker's natural baselayer, the 175 Everyday crew offers breathability, temperature and comfort whatever the weather. The premium, super-fine merino wool to keep you warm and flexible for all kinds of adventure. An enhanced rib-knit structure promotes stretch and next-to-skin comfort, ideal for trail running, hiking, climbing or any other kind of agile sport.

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