Multi Functional Hot Water Bottle - Thermoplastic material that is recyclable. Advanced thermoplastic holds heat longer than traditional hot water bottles with cover, also works as an ice pack, or cold water bottle. But please Caution: The hot water bottle rubber is not suitable for Microwave oven heating.Easy To Use - Wide mouth is easy to fill and the anti spurt lip of hot water bottle with cover prevent water spitting back out like those old rubber ones. Fill only to two-thirds capacity maximum. It's transparent. No more guesswork about how much hot water is inside.Helpful Assistant - The classic design of this classic hot water bottle. Treating sore muscles, stress or cramps, arthritis, aches and pains, stiff necks, lower back pain, Gifts for women menstrual cramps and other common aches and and can also double up as a cold compress for person with fever or to reduce swelling for minor injuries. Good mothers day gifts for mom.