Under Armour Men's ColdGear Infrared Tactical Short Sleeve 100% Other Fibers Imported ColdGear Infrared technology uses a soft, thermo-conductive inner coating to absorb & retain your own body heat Dual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exterior 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