Under Armour Men's ColdGear Infrared Tactical Fitted Crew 87% Polyester, 13% Elastane Imported ColdGear Infrared uses a soft, thermo-conductive inner coating to absorb and retain your own body heat Dual-layer fabric gives you a soft, warm interior and a smooth, fast-drying exterior 4-way stretch fabrication allows greater mobility and maintains shape Moisture transport system wicks sweat away from the body Quick-dry fabrications keeps you light and comfortable