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      Smartwool updated the fit of Smartwool's Men's Merino 250 Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one ofSmartwool'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 skiing, hiking, running, and more.

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