Professional Material: -- Thermoplastic material that is odorless and recyclable. Advanced thermoplastic material and unique design that retains heat longer than a traditional hot water bottle. Can also be used as an ice pack or cold water bottle. Please note that this bottle is not suitable for microwave heating. Safe & Easy to Use: -- The hot water bottle with a wide mouth is easy and safe to fill and use. The hot water bottle has passed pressure and leak tests and is safe for daily use. Pregnant women and children can use it safely because it is odorless and environmentally friendly. Please only fill it with two-thirds of 80-degree hot water. Product Highlights: -- The hot water bottle was leak-tested and sealed within 24 hours before leaving the factory. Also, the product's advanced design can retain heat for an extra long time. The ribbed outer surface helps maintain temperature and give you a warmer night. Helpful Assistant: -- Hot water bottles can not only be used to keep you warm, but are also excellent for relieving aches and pains. In addition, it can also treat colds and coughs, dysmenorrhea, and other common aches. It can also be used as a cold compress for people with fever or to reduce swelling for minor injuries.