Three-piece adjustable thickness, adjustable high-viscosity Velcro, connected to the buckle, can make the body and the product fixed brace consists of two sides and the middle piece can be disassembled and adjusted. Perforated breathable lining, perforated breathable design, enhance the ventilation effect, drive away the sweltering, and wear comfortably. Reinforced Velcro, with suede strap design, lasting stickiness and good fixing. Widening the 4 straps is more fixed, and the patient who bandages the knee position is better protected and comfortable to wear. 4 detachable support steel bars, two curved steel bars fit the knee to prevent falling, and two side support bars fixed the steel bars.