Under Armour Coldgear Infrared Grid Zip Mock - Men's Dual-layer, textured-grid fabric traps heat for unrivaled warmth with very little weight ColdGear Infrared uses a soft, thermo-conductive inner coating to absorb and retain your own body heat Moisture Transport System wicks sweat away from the body Anti-odor technology prevents the growth of odor causing microbes Drop shoulder seams for a chafe-free swing