Voler Sol Skin Knee UV Protector Silicone gripper at the top and bottom hems ensures a comfortable, secure fit. Offers sun protection of 50+ UPF. The Quantum DSX fabric has excellent breathability while the dimpled surface reduces wind drag. The articulated design prevents uncomfortable bunching behind the knee and helps keep them in place (the seam is worn behind the knee.) Can increase the cooling effect by soaking with water.