Men's Classic Thermal Merino Base Layer 1/4 ZipWith an updated fit, the Smartwool Men's Classic Thermal Merino Base Layer 1 4 Zip has improved functionality while also enhancing aesthetics. As one of Smartwool's 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
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