Champion Duofold Men's Thermals Mid-Weight Base-Layer Underwear 60% Cotton Importado All-in-one slip comfortably smooths out all your trouble areas. Choose these base-layer bottoms for everyday warmth during low activity levels. Soft texture-rich knit traps air between two thermal layers. Result: a chill-blocking barrier that keeps you comfortably warm. Tag-free elastic waist wicks moisture for added comfort. Ankle length, with chill-blocking rib-knit cuffs and non-chafe flat-locked seams. Close-to-body fit, with convenient front fly. Cotton for softness. Polyester for durability.