Relieves back pain, muscle stiffness and fatigue Air-activated patch generates an average 40℃ natural therapeutic heat which quickly penetrates into the affected areas continuously for 18 hours, effectively relieves back pain, muscle stiffness and fatigue. Extra large sized patch of width 26cm allows it to cover firmly and thoroughly the entire back of your body. It ensures the therapeutic heat to radiate through the affected areas and penetrate to the source of pain. Effectively promotes blood circulation, relieves pain and relaxes tense and sore muscles, increase mobility. Non-medicinal, fragrance free, without any side effect, suitable for persons who are allergic to medicine. Thin and discreet patch, ideal to use anywhere. - For external use only - Do not eat. - Do not use on children. - Please use under supervision on those who are unable to remove the heat patch by themselves such as the elderly or physically disabled. - Only tear to open the sachet when you are ready to use. - Tear to open the sachet by hand (do not cut) and take out the heat patch. - Remove the thin film, adhere the heat patch to clothing or underwear over the painful area of your back. - Do not knead this product, It is air-activated, it warms up gradually and reaches maximum heat within approximately 30 minutes.