UA CoolSwitch uses an exclusive coating on the inside that pulls heat away from your skin, making you actually feel cool & able to perform longer. Mesh back & underarm panels deliver strategic ventilation. 4-way stretch fabrication allows greater mobility in any direction. Moisture Transport System wicks sweat & dries fast. Anti-odor technology prevents the growth of odor-causing microbes. Reflective logos for greater visibility on low-light runs.