The Smartwool Thermal Merino 1/4 Zip has been updated 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 flat-lock seam construction to help minimize chafing as well as help keep you comfortable and temperature regulated as you enjoy cross country skiing, hiking, running, and more.
Check out our base layer pants here.
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