Whether you're on the move, or in and out all day, this basic 2-layer thermal from ColdPruf® is the ideal blend of warmth and comfort for everyday use. Model: 90A Color: White Two-Layer engineering Traps air between layers providing a natural barrier of warmth Inside and outside: 60% combed ringspun cotton / 40% polyester Tagless neck label Flat seams for comfort Extended tail to help stay tucked in Rib cuffs True sizing for accurate fit ThermaChoice® System – Made for Cold/Very Cold Weather and Low/Medium Activity NOTE: Thermal Underwear cannot be returned once the package is opened, so please use the size guide to help find the right size for you.