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. - Fitted: Next-to-skin without the squeeze. - 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 - Smooth, chafe-free flat seam construction - Articulated, ergonomic mock neck with ARMOUR wordmark on back - 87% Polyester/13% Elastane