Our slim fit is intended to follow the contours of the body100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistanceFlatlock seam construction and offset shoulder and side seams designed to increase comfort and minimize chafingSide seams wrap to front for body-enhancing fitContent: 100% Merino Wool. Exclusive of Decoration.Our 100% Merino wool base layers are a wardrobe essential for every explorer, but this men's top is fashionable enough to wear out on the town, too. The side seams wrap to the front for a slim, body-enhancing fit. And the ribbed hoodie construction adds texture and style — perfect for happy hours and happier adventures. Smartwool Men's Classic Thermal Merino Base Layer Rib Hoodie