Smartwool Classic All-Season Merino Base Layer Bottom Men's (Iron Heather)

Men's Classic All-Season Merino Base Layer 1/4 Zip col. Grey

Men's Classic All-Season Merino Base Layer Crew col. Grey

Meet the better-than-ever Men's Merino 250 Base Layer Crew. Shoulder panels eliminate top shoulder seams and a flatlock seam construction helps minimize chafing. Add one of our best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking.

Smartwool Men's Classic Thermal Merino Base Layer Crew - Winter Moss Heather

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Smartwool Classic All-Season Merino Base Layer Bottom - Men's, Merino Bottoms

Shop Smartwool Altitude Sports

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.

Smartwool Classic All-Season Merino 1/4-Zip Base Layer - Men's Twilight Blue, M

Looking for an ordinary shirt that can keep up with all of your adventures? The year-round Merino 150 Base Layer Short Sleeve is up to the challenge. With their Core Spun technology, they've wrapped Merino around a nylon core for added durability while still keeping the comfort of ultra-soft, responsibly sourced Merino next to skin. And select colorways feature a more responsible plant-based-dye technique.

Smartwool Men's Merino 150 Baselayer Short Sleeve, Ocean Blue / XXL

Premium Men's Merino Wool Shirts

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.

Smartwool Classic All-Season Merino Base Layer 1/4 Zip Men's (Black)