The RK-1 Iliotibial band syndrome from the brand Zamst is a knee support for pain-free running.For example, the RK-1 is designed with a iliotibial band that connects the Fascia Lata tensor to the tibia. In the flexion position, the band is behind the head of the femur. In the extended position, it is at the front. The repeated friction (180 times per minute!) is responsible for the inflammation of this band and therefore the pain. The ultra-lightweight and very comfortable fabric design will compress in the right place to relieve pain. The spiral design of the strap and the positioning of its anchor point promote proper alignment of the leg (by limiting internal rotation) during running. The lateral reinforcements also help to improve the stability of the joint.You'll forget you're wearing the RK-1 and you can enjoy running again!