... salt,water etc Outer bag: PE,nonwovens4: Up to the temperature:53°C, get heating in seconds ... No need for preheating ahead of time, convenient to carry and use.6:The lasting time of ... heating when you are climbing,travelling,camping,going to school etc.8:We aslo welcome OEM.and ... .Such us:the size,colour,shape,thickness, something related to our products(sleeve,cover,pouch perfect packing gift box ...