Duofold by Champion Thermals Men's Long-Sleeve Base-Layer Shirt, Winter White, XL 6-oz. 60% cotton (for softness)/40% polyester (for durability) Soft texture-rich knit traps air between two thermal layers. Result: a chill-blocking barrier that keeps you comfortably warm. Close-to-body fit allows for easy layering. Tag-free banded crewneck won't itch or scratch your neck. Non-chafe flat-locked seams feel soft against your skin.