The Nike Pro Hyperstrong Calf Sleeves is made of a lightweight materal that helps warm muscles and supports joints. By keeping your muscles warm and supported, you keep your body injury-free so that you can push harder in your game. The Nike Pro Hyperstrong Calf Sleeve helps increase blood flow and gives you supportive comfort so you can keep playing without putting your body in danger. The Mesh Zones are located in high-heat areas and enhance airflow. The contoured design offers freedome of movement.