Product Description Material: Nylon size: S: The leg circumference is 29-38 cm, the length of the knee pad is about 28 cm, and the weight is 80-100 catties M: The leg circumference is 39-47 cm, the length of the knee pad is about 28 cm, and the weight is 100-140 catties L: The leg circumference is 48-55 cm, the length of the knee pad is about 28 cm, and the weight is 140-180 catties Color: skin color, black Quantity: 1 pair Package content: 2*knee protectors 1.Self-heating mode: Self-heating knee pads provide natural warmth to the knee area through magnetic field therapy, relieve knee joint pain, and relax the stiff and painful muscles around the knee. It can also stimulate blood circulation, improve blood circulation, and relieve joint pain. 2.High-quality material: Self-heating knee pads are made of high-quality nylon, which has greater elasticity and density, improves wearing comfort, and is suitable for most people's figures. A heating pad can provide you with the warmth you need and relieve pain. Suitable for male and female knees. 3.Reusable: The knee pads can be washed and dried naturally. Put the self-heating knee pad directly on your knee and wait for it to heat up. After the heating is turned down, you can wipe the surface of the knee pad with a damp cloth. 4.Efficacy: Magnetic therapy provides natural heat to the knee area, relieves pain by relaxing the muscles, and provides you with much-needed comfort. It can also be used on calves, thighs and arms. Used to relieve muscle pain and cramps. 5.Applicable objects: protect your knee joint osteoarthritis, sports, bruises, edema, and daily activities and health care. They are very suitable for various activities and sports, such as walking, hiking, jogging, running, basketball, netball, squash, badminton, volleyball, football, tennis, skiing, snowboarding, cycling, track and field, gym, dancing, etc.