The Under Armour Men's Tactical Coldgear Long Sleeve Base Layer Shirt retains body heat and delivers unmatched warmth. Constructed of a 4-way stretch material, the base layer moves with you while keeping you comfortable. Features4-way stretch material moves better in every directionMaterial wicks sweat & dries really fastColdGear Infrared lining uses a soft, thermo-conductive inner coating to absorb & retain body heatMock neck construction for added coverageDual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exteriorCare InstructionsDo not ironTumble dry lowDo not use softenersDo not dry cleanUse only non-chlorine bleach when neededMachine wash cold with like colors