The construction of this soft knee brace/strap puts pressure on the patella tendon, stabilizing it, reducing the pain and discomfort from jumping and repeated bending and unbending of the knee. Tightens easily with a single Velcro pull strap. The special material utilized dissipates moisture to keep the knee area dry and comfortable. The fabric and lining are 100% Nylon. Neoprene is also incorporated.