YONEX YONEX Wrist Supporter Muscle Power Wrist Size (Unit: cm) Length of measurement position: L: 17-20 Material: Nylon knit, silicone, chloroprene The uneven silicone suppresses wrist bending and prevents tenosynovitis. It suppresses excessive stretching of the extensor retinaculum. *Size measurement area: Base of the hand *The supporter should be slightly tight to optimally support your play. *Muscle Power Supporter supports play during sports and is not expected to be effective for daily use.