Safe and explosion-proof: Knitted fabric design flush & use, so convenient, there is no leakage of dangerous insulation lasting The hot water bottle use high quality materials thickened version of rubber, heat resistance to aging, insulation more durable environmental protection No smell: natural rubber, strong elastic insulation waterproof. Note: 1.Do not use boiling water Fill not more than 2/3 full and expel air ensure stopper is securely fixed stopper empty and with stopper removed. 2.Warning-hot water bottles can cause burning avoid prolonged direct contact with the skin.