The Under Armour UA Velociti Pro Men's T-Shirt is made of Iso-Chill fabric that dissipates body heat for a cool feel. The T-shirt has four-way stretch for better movement and dries quickly. It has an increased number of perforations for better airflow and provides UPF 30 protection against UV rays. Odor control technology minimizes odor and reflective elements increase visibility when running in low light.