Provides medical grade support and graduated compression to ease the pain of patella tendonitis (also known as jumper’s knee). Compression Zone Technology makes the PS3 effective while still being easy to take on and off, light and comfortable to wear - even under normal active wear clothing. Unlike similar patella straps that rely on hook and loop fastner or other fasteners, the PS3 is safe, stays in place during any activity & will not bind behind the knee.