1 Brand new and high quality 2 Flexible to do sports， more comfortable wearing. 3 Four springs support design， more ergonomic design 4 Open design， more comfortable to wear 5 Adjustable and durable 6 EVA gasket design， very comfortable Model: SX516 Color: Black Material: 75% synthetic rubber， 25% nylon Size: ( unfold length x width ) about 57 x 31 cm ( the widest width )， one size， suitable for knee circumference 31-45cm Thickness: 3.7 mm Applicable: knee pain and discomfort， mild strain/sprain， knee fatigue， patellar instability， fitness and a variety of sports. 1 x Knee brace