Under Armour Men's ColdGear Infrared Grid &frac12; Zip Mock 100% Polyester Imported Dual-layer, textured-grid fabric traps heat for unrivaled warmth with very little weight ColdGear Infrared technology uses a soft, thermo-conductive inner coating to absorb & retain your own body heat Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes Smooth, chafe-free flatlock seam construction