Champion Duofold Varitherm Mid-Weight 2-Layer Kids' Thermal Shirt Single-layer 5.5-oz. 96% polyester/4% spandex with 360-degree stretch and quick-drying moisture control Tag-free crewneck won't itch or scratch. Soft mid-weight jersey fabric traps warmth for thermal protection, wicks moisture for sweat-free comfort, dries quickly to chase away chills, even controls garment odors. Resists pilling, too, for longer lasting wear! 360-degree stretch provides ultimate ease of movement. Flat-lock seams won't chafe or dig.