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 slick, fast-drying exterior. 4-way stretch fabrication allows greater mobility in any direction. Moisture Transport System wicks sweat & dries fast.