Hot water bottle interior is made of PVC material and the exterior is made of flannel material will feels very comfortable when touched and has the characteristics of heat resistance warmth anti-scalding and explosion-proof. It easy to fill and helps prevent water from splashing back out like older rubber hot water bottles. The cute rabbit plush cushion helps to isolate the hot water and maintain its effectiveness for 6-8 hours. Put it under the bed cover to eliminate the cold night air, or use it as a heating bag to relieve back pain, you will feel the soothing comfort of the heating bag for a longer period of time. Hot water bag works great for pain relieving, arthritis, sports injuries and period cramps. Hot therapy helps to relax your tired muscles and tensed shoulders from stress and too much workout. it also works as an excellent cold pack for kids with fever or to reduce swelling for minor injuries. Non-electric and travel-friendly, you can use them at home, in the dorm and during travel. In order to offers premium quality lifestyle products to improve your well-being. Our team is always available to help you get the most out of your purchase. 100% Satisfaction guaranteed.