Under Armour Men's UA ColdGear Infrared Heartbeat188; Zip Large AMERICAN BLUE Soft anti-pick, anti-pill fabric has a cleaner, snag-free finish. 4-way stretch fabrication allows greater mobility & maintains shape. Anti-odor technology prevents the growth of odor causing microbes. Moisture Transport System wicks sweat away from the body. ColdGear Infrared uses a soft, thermo-conductive inner coating to absorb & retain your own body heat.