[Professional Material] -- Thermoplastic material which is odorless and recyclable. Advanced thermoplastic material and unique design that holds 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 bottle with a wide mouth is easy and safe to fill and use. The hot water bag has passed the pressure resistance and leak-proof test which is safe to use for people in daily. Pregnant women and children can use it safely since it is odorless and ecofriendly. 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 advanced design can retain heat for an extra long time. Ribbed outer surface helps maintain temperature and give you a warmer night. [Helpful Assistant] -- Hot water bottle can not only be used to keep warm, but are also work great for relieving aches and pains. In addition, it can also relieve 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] -- We are confident with the quality of our hot water bag. Any problems can be contacted by email.