Exclusive UA Scent Control technology lasts longer & works better, keeping you undetected. ColdGear Infrared technology uses a soft, thermo-conductive inner coating to absorb & retain your own body heat. 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 flatlock seam construction.