Every serious runner needs a super-breathable shirt like this, it's light, won't chafe, and will wick sweat to keep you cooler all run long. The soft, ultra-lightweight fabric delivers superior breathability and incredible comfort. The material wicks sweat and dries really fast. Features anti-odour technology prevents the growth of odour-causing microbes, dropped, shaped hem for enhanced coverage and reflective details. 100% Polyester.