Under Armour Men's ColdGear Infrared Lightweight 1/4 Zip 93% Polyester, 7% Elastane Imported ColdGear Infrared technology uses a soft, thermo-conductive inner coating to absorb & retain your own body heat Insanely soft, smooth fabric for total comfort, all day long 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes