Product Number: ZAMST EK-5 ZAMST EK-5 I bought this because I wanted firm support when I hurt my knee. It can be used on either leg. One of them has only been used once or twice. It cost over 5500 yen for one. When standing normally, the circumference of the thigh 10cm above the kneecap is 36cm-40cm. Stable support without hindering movement The unique active resin stay (patent pending) that makes it easy to bend and straighten the knee, and the pads around the kneecap, provide firm knee stability. Increases compression The thigh cross strap, an elastic thigh cross strap, increases the compression on the upper knee. It also adapts to all movements and prevents slippage. Highly breathable back of the knee Power double russell, which maintains breathability and provides moderate compression, is used for the back of the knee. Breathability Material When standing normally, the circumference of the thigh 10cm above the kneecap is 36cm-40cm.