DURABLE MATERIAL:it is made from rubber.The large capacity design,Ribbed outer surface helps maintain liquid temperature. Size:10.3cm x 7.5 cm x 16cm. . MULTIPLE FUNCTIONS: The hot and cold hot water bottle with wide mouth is easy to fill and use. The hot bag for pain relief. Use it for shoulder pain, medical purposes, as a feet warmer. . KEEPS YOU WARM FOR HOURS:It can provide you with a warm bed after you put the hot water bottle in the bed shortly before going to bed. It is also a perfect gift. . WARM DESIGN:The outer knit filling is not only attractive, but also prevents direct contacts with the skin on the surface of the hot water bottle. Each part is carefully designed. . SOFT TO THE TOUCH:Pure Natural Rubber,anti-aging, longer lasting insulation,the plush jacket of the hot water bottle is smooth and comfortable.