FEATURES:- 100% Merino - Soft merino fibers that regulates body temperature in all weather conditions and resists odors.-Rib-knitting structure for perfect warmth in minimum bulk.-Flatlock seams prevent chafing.-Longer back protects from the cold.-Raglan sleeves for max mobility. Composition:-100% Merino Wool.Fitting:-Next-to-skin.GSM:-180. Compare prices from: Thermowave in Men's Underwear