1、Self-warming Knee Pads: The new self-warming knee pad provides the knee area with natural warmth through magnetic care, relieves discomfort in the knee joint and relaxes the stiff and discomfortable muscles around the kneecap. It can also stimulate blood circulation and improve blood circulation to relieve joint discomfort. No need to connect to the power supply. 2、Reusable: The knee pads can be washed with water and dry naturally. Wear the self-heating knee pad directly on your knee and wait 20 minutes for it to get hot. When the heat is turned down, you can wipe the surface of the knee pad with a damp cloth. 3、Effectiveness: It provides the knee area with natural heat, which relieves discomfort by relaxing the muscles and giving you much-needed comfort. and can also be used on calves, thighs, arms. For the relief of muscle discomfort and cramps. 4、Lightweight and Convenient: It uses imported high-speed precision knitting machine with greater elasticity and density, which greatly improves wearing comfort and fits most people s figures. The heating pad can provide you with the warmth you need and relieve discomfort. Suitable for both male and female knees. Material: polyester, absintheSuitable for: running, health massage, fitness, cycling, snow and ice sports, hiking, camping, dancing Size (approximately):S: 40-50kg, leg circumference: 29-38CM, knee pad length: about 28cmM: 50-70kg, leg circumference: 39-47CM, knee pad length: about 28cmL: 70-90kg, leg circumference: 48-55CM, knee pad length: about 28cm