Features： 1、Increase the strength of the knee by 40kg, reduce the pressure of the body on the knee after squatting. 2、The universal strap style can be worn by men, women and children, reducing weight damage to the knees. 3、Adjustable size with hook and loop strap, suitable for everyone, the special made spring has strong elasticity. 4、The mesh is breathable, not airtight, specially designed for hardy workers, non‑slip fabric. 5、After equipped with a booster, the rebound spring starts to help climbing and carrying heavy objects when the knee is bent about 45°. 6、Hand‑tightened copper‑plated screws, easy to disassemble, no tools, free combination, no need to worry about complicated steps. 7、For those with severe knee damage, 3 springs are recommended, and 1‑2 springs for walking, climbing, running, and cycling to protect the knees. Specification： Item Type: Knee Joint Support Pads Material: Carbon Steel Spring + Double-Sided Composite Neoprene + Hook and Loop Strap + Screw + Plastic Shell Product Function: Suitable for climbing, mountaineering, sports fitness, heavy work, etc. Package List： 2 x Knee Joint Support Pads