Self-Heating Knee Support Pads is designed to control heat and support knee pain, this self-heating pad can be worn under clothes and bring relief in knee injuries. The Knee pads produces heat after 20-30 minutes of being placed on the knee. Great for painful knee injuries. It also helps soothe pain.You can get 1,2 or 4 knee pads. Limited stock avaliable. Save upto £10 on Knee Support Pads. This wonderful self-heating pads will ease knee pain Contains real mineral, some herbs and magnets. Doesn't needs any electrical charge. Get Free Delivery & easy Return.