Under Armour Women's ColdGear Infrared Crew 63% Polyester, 34% Rayon, 3% Elastane Imported ColdGear Infrared technology uses a soft, thermo-conductive inner coating to absorb & retain your own body heat Material wicks sweat & dries really fast 4-way stretch construction moves better in every direction Anti-odor technology prevents the growth of odor-causing microbes