Champion Duofold by Originals Wool-Blend Men's Union Suit 2-LAYER 6.3-OZ. FABRIC: 100% cotton inside; 65% cotton/25% Merino wool/10% nylon outside 2-LAYER 6.3-OZ. FABRIC: 1% cotton inside; 65% cotton/25% Merino wool/1% nylon outside 2-LAYER 6.3-OZ. FABRIC: 1% cotton inside; 65% cotton/25% Merino wool/1% nylon outside Ribbed elasticized cuffs help seal out cold and chill. Flat-locked non-chafe seams feel smooth against your skin. Details include tag-free collar, full-length button-down placket, and convenient rear fly.