[Professional Material] -- Thermoplastic material which is odorless and recyclable. This kind of thermoplastic material can hold heat longer than a traditional hot water bottle. Could be used as an ice pack, or cold water bottle. Note, this is not suitable for Microwave oven heating. [Safe & Easy to Use] -- The hot water bag is explosion-proof, leak-proof which is good for daily use. Pregnant women and children can use it safely since it is odorless. Please fill only two-thirds 80 degree water into it. [Product Highlights] -- The hot water bottle has been done the leak detection and sealing detection within 24 hours before leaving the factory. Also, the product can retain heat for an extra long time. Ribbed outer surface helps maintain liquid temperature. [Best Assistant] -- This hot water bottle can ease joint disease, sore muscles, cold and cough, dysmenorrhea and other common aches.It can also be a cold compress for people with fever or to reduce swelling for minor injuries. [100% Satisfaction Guarantee] -- You can return the undamaged product and packaging without any reason within 30 days. We also offer you 1 year warranty regarding quality issues. Any problems can be contacted by email.