Our Men's Classic Thermal Merino Base Layer Colorblock Crew features 100% Merino wool made with a flatlock seam construction and offset shoulder and side seams designed for enhanced comfort, breathability , thermoregulation, and odor resistance. From hiking to running and skiing, this base layer brings consistent comfort, plus reliable warmth and durability, for every winter activity. | Smartwool Men's Classic Thermal Merino Base Layer Colorblock Crew Top in Charcoal/Honey Gold | Size: Small