Our Cartilage Technology contain Nylon 86% and Spandex 14%. It can stimulate the regeneration of articular cartilage by using far infrared therapy, increase the blood flow in the treatment area, thus restoring the health of the knee joint and rejuvenating the knee joint. Its use is very simple: connect the USB port to charge, hold down for 3 seconds to open and close, short press to adjust the temperature. It can help regenerate cartilage, relieve pain and stiffness, and improve joint function.