Multifunctional hot water bottle - Recyclable thermoplastic material. Advanced thermoplastic keeps heat longer than traditional hot water bottles with covers, also works as an ice pack or cold water bottle. But be careful: The rubber hot water bottle is not suitable for microwave heating. Easy to use - Wide opening is easy to fill and the anti-splash lip on the hot water bottle with cover prevents water from splashing back out like the old rubber ones. Fill only to a maximum of two-thirds of the capacity. It is transparent. No more guessing how much hot water is inside. Helpful assistant - The classic design of this classic hot water bottle for pain relief. Treat sore muscles, stress or cramps, arthritis, aches and pains, stiff neck, lower back pain, Mother's Day gifts for mom, menstrual pain and other common aches and can also be used as a cold compress for children with fever or to reduce swelling from minor injuries. Care instructions - The grid structure makes skin contact safer and more comfortable. Comes with an elegant knitted cover for the hot water bottle to prevent the hot rubber from coming into direct contact with the skin and causing burns, plus it provides a more elegant and personalized look. The rubber hot water bottle should be replaced after two years of use. And regularly check that the stopper is not worn or damaged.