Duofold Originals Men's Tall Bottoms, M-Blue Jean base-layer-underwear closure 6.3-oz. fabric has two smooth thermal layers. Outer layer blends warm Merino wool with sleek polyester and nylon. Inner layer is pure cotton, for softness next to your skin. Together, both layers trap air to form a thermal barrier. Tag-free elastic waist wicks moisture for added comfort. Flat-lock seams won't chafe or dig. Body-sized cut provides custom fit. Convenient front fly. Ankle length for tall men, with shape-keeping ribbed cuffs. 100% cotton inside; 65% polyester/25% Merino wool/10% nylon outside