It is made of neoprene material. The hinges that adjust the degrees of knee flexion (0 °, 15 °, 30 °, 60 °, 90 °, 120 °) and extension (-15 °, 0 °, 15 °, 30 °) are portable for individual adjustment. The silicone strip on the inside prevents the product from slipping. The posterior popliteal opening prevents discomfort and pressure by folding during flexion of the knee.