Under Armour Boys Ua ColdGear Infrared Everyday Crew (Big Kids) Imported Machine Wash ColdGear Infrared uses a soft, thermo-conductive inner coating to absorb and retain your own body heat Ridiculously soft, smooth fabric delivers superior comfort, all day 4-way stretch fabrication allows greater mobility and maintains shape Moisture Transport System wicks sweat away from the body Anti-odor technology prevents the growth of odor causing microbes