With the Merino 250 quarter zip, you quit only when you want to. With next-to-skin Merino, it wicks and regulates core temp. First Layer fit with no-chafe. This heavier, soft, 100% Merino wool fabric offers breathable warmth, moves sweat away from the body, and provides next-to-skin comfort in colder conditions. Slim Fit 100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance 10" (25 cm) center front zipper Shoulder panels eliminate top shoulder seams Flatlock seam construction designed to eliminate chafing Knit in Vietnam: 100% Merino Wool Garment Weight: 285 g = 10.05 oz