UA Microthread technology in the fabric dries faster, won't cling to you, won't chafe & stretches without absorbing sweat|Material wicks sweat & dries really fast|Anti-odor technology prevents the growth of odor-causing microbes|Mesh panels for added breathability|Ergonomic shaped hem for enhanced coverage|Classic racer back construction with slightly dropped armholes|Reflective details for greater visibility on low-light runs