Under Armour Boys ColdGear Infrared Multiplier Mock (Big Kids) Synthetic Imported Machine Wash Dual-layer ColdGear Evo fabric has an ultra-warm, brushed interior & a slick, fast-drying exterior ColdGear Infrared technology uses a soft, thermo-conductive inner coating to absorb & retain your own body heat 4-way stretch fabrication allows greater mobility in any direction Moisture Transport System wicks sweat away from the body Anti-odor technology prevents the growth of odor causing microbes