The Under Armour UA Velociti Pro Women's T-Shirt is made of lightweight Iso-Chill material that wicks heat away from the body and provides a cool touch. Four-way stretch technology provides better movement in every direction. The material quickly wicks sweat and dries quickly. Laser perforations and breathable sides improve airflow. UPF 30 protects the skin from the sun's harmful rays, and reflective details increase visibility when running in poor light conditions.