The ColdGear® Infrared technology holds heat so you warm up faster and stay that way longer. All without adding weight or bulk. ColdGear® Infrared technology uses a soft, thermo-conductive inner coating to absorb and retain your own body heat Soft anti-pick, anti-pill fabric has a cleaner, snag-free finish 4-way stretch fabrication allows greater mobility in any direction Moisture Transport System wicks sweat away from the body Anti-odour technology prevents the growth of odour causing microbes UA's signature, sweat-wicking technology pushes sweat away from your body to the surface of your gear so it dries faster.