Open front panel design of below the knee conforms to calf thickness and shape with large individual differences. This product provides individualized fit. Patella pads compress around the patella.A semicircular patella pad that gently and precisely compress the patella enhances stability of the knee.Guard unstable movement We use unique active resin stays (patented in Japan) that are designed to let you bend and stretch smoothly while it inhibits lateral movement of the knee. Multiple supports for the movements with double strap The X (cross) strap on the front and bottom of the main body and the parallel strap on the thigh and the back of the knee effectively compresses to accommodate the movement of the muscles of the thigh and lower leg. They also suppress the anterior movement of the lower leg.