Brand from Japan: Kobayashi. Air-activated patch generates an averages 40°C natural therapeutic heat which quickly penetrates into the affected areas continuously for 10 hours, effectively relieves neck and shoulder pain, muscle stiffness and fatigue.Unique U-shaped design allow it ti adhere fitly and firmly to clothing around both the back and sides of the neck and the shoulders.It ensures the therapeutic heat to radiate through the affected areas and penetrate to the source of pain.Effectively promotes blood circulation, relives 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 around the base of the neck.Do