Champion Duofold by Duofold by Varitherm Men's Thermal Shirt Mid-weight 5.5-oz. quick-drying 96% polyester/4% spandex jersey with 360-degree stretch. Performance benefits last the life of the garment: Will not wash or wear out. Imported Sleek expedition-weight fabric traps warmth between two thermal layers. Plus, it wicks sweat from your skin, dries quickly for chafe-free comfort, even resists garment odors. Sleek expedition-weight fabric traps warmth between two thermal layers. Plus, it wicks sweat from your skin, dries quickly for chafe-free comfort, even resists garment odors. Drop-tail hem provides extra coverage. Tag free  no itch, no scratch  with non-chafe flat-lock seams. Great on its own or as base-layer thermal underwear.