Under Armour Women's ColdGear Infrared Tactical Crew 100% Other Fibers Imported Dual-layer ColdGear construction combines a smooth, fast-drying exterior with a brushed, heat-trapping interior ColdGear Infrared uses a soft, thermo-conductive inner coating to absorb and retain your own body heat Material wicks sweat & dries really fast Lightweight, 4-way stretch construction improves mobility and maintains shape Anti-odor technology prevents the growth of odor-causing microbes