The shirt is made from lightweight Iso-Chill fabric that helps wick away heat, so it feels cool to the touch. It has 4-way stretch for better mobility, wicks away sweat and dries quickly. Laser perforations increase airflow, and breathable side hems and reflective details improve visibility while you run. Odor control technology minimizes odor, and UPF 30 provides protection from the sun's harmful rays.