World Pride Women's Black Breathable Patella Knee Sleeve Brace Support Guard Stabilizer Hook and loop closure design fits most knee sizes (31.8-40.6cm measure the circumference of the knee at the patella with the knee full extended) Fully adjustable velcro to make it close tighter and better compression Exclusive reinforced stabilizers to prevent displacement; Retains body heat to warm knee joint and increase blood circulation High quality rubber insulation sleeve & double-sided nylon texture to provide the best treatment Material: 75% stretch nylon + 25% rubber foam