FREEDOM OF MOVEMENT AND BREATHABILITY. The Nike Pro Tank is made of sweat-wicking fabric in a proven profile that's ideal for your workouts. The fabric has been thinned to reduce weight and increase breathability. Sweat-wicking properties Dri-FIT technology wicks sweat away from the body and keeps you dry and comfortable. Breathable Burnout Design The "Just Do It." pattern makes the material thinner. This minimizes weight and improves air circulation to keep you cool. Freedom of movement The wide armholes allow unrestricted freedom of movement and the slightly rounded hem guarantees protection.