Uses: physiotherapy and health care knee pads, protect knees, relieve knee pain, heat to promote , protect knees from cold Note: a few people may have skin during use, which is normal and will not damage the skin by burning or redness. However, wearing time can also be shortened. Product specifications: Item type: spontaneous heat protector Efficacy: promote , promote metabolism, dredge channels and collaterals, enhance immunity and protect knees Material: polyester fiber Packing weight: 0.25kg Usage: Step 1 apply directly to the knee. : after 20 minutes, you should feel hot (if you don't feel hot, use a wet towel to wipe the surface). Step 3: use it twice a day for about 3 hours each time (don't use it in bed) Step 4: this is normal, some people with sensitive skin may feel burned or their skin turns red. It can harm the skin and can shorten the use time according to personal situation. Step 5: you can wear clothes, but the thermal effects will fade and the effects will work properly. Package includes: 1× pair of spontaneous heat pads Find answers in product info, Q&As, reviews Package Including 1 * spontaneous heat padsUses - physiotherapy and health care knee pads, protect knees, relieve knee pain, heat to protect knees from cold, with meniscus, bone, bursitis and chronic pain, cramps, etc. Self-Warming - This Knee Brace built-in self-heat, it would warm-up itself (the exact time varies from person to person). EASY TO USE AND SIZE FOR EVERYONE - Use in different situations, such as: relaxing at home or working in the office. Perfect for Mother's Father's Birthday Gift, Thanksgiving Gift and Christmas Gift. Pain Helpful - Helps improve clear meridians, relieve local physical fatigue and pain, anti-inflammatory and analgesic,. KNEE PAIN RELIEF - You can use the heated knee brace in seconds just like regular knee braces, providing ultra-comfortable heat therapy for knee relief and injury recovery. It promotes internal circulation and relieves knee pain and can also be used on calves, thighs, arms to relieve muscle pain and cramps.