Our Micro wave oven achieved big success in the market by many years researching , and achieved the national patent in August ,2004. It use concretion material to make the water like jelly ,even the bag breaks, the material in the bag would not go into the clothes and hurt the skin.And water inside the bag becomes plasm state,and before you use I t,just put it in the micro wave oven hot up for two minutes ,quick,safe, good for enviorment and save power. It use high ?tech material and can keep warm longer. It don?t need changing water and would not hurt. it also can be kept in Icebox to make it cold used in Summer.