This is the first layer you put on every time the mercury dips. It's the weight of a T-shirt, fits comfortably next-to-skin, wicks away sweat, and keeps you amazingly warm. If you work out when it's cold, you better do it in ColdGear® Armour. !!!!Product DNA!!!! Fitted: A slimmer, more athletic cut. Dual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exterior 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes 87% Polyester/13% Elastane Imported