Brand from Japan: Kobayashi. Air-activated patch generates approximately 48°C natural therapeutic heat, will last about 18 hours with an average temperature greater than 40°C.Heat quickly penetrates into the affected areas, effectively relieves back pain, muscle stiffness and fatigue.Extra large size 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 stiff and tense muscles, increase mobility.Fragrance free, non-medicinal, without any side effect, suitable for persons who are allergic to medicine.Thin and discreet patch, ideal to use anywhere.How to use: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 the outside of the clothing or underwear over the painful area