... reusable gel pack 2.hot or cold compress to painful area 3.Certification MSDS, CE, ISO13485 4.supply OEM cold hot pack ... diversified biological elements.2.no side effect to human body.3.the bag elastic and it can remain soft ... sunstroke, scald, muscle scuffing, sprain, trauma haemostasis, beauty etc.Hot compress:arthritis, rheumatism, menorrhalgia, stomach trouble, cervical vertebra trouble, sciatica ...