Made of high density thickened PVC material, durable, soft and eco-friendly. Good for both hot and cold therapy as an hot or cold water bottle. great for soothing muscle soreness, fatigue and relief of stiffness in the neck, lower back, knee, shoulder, ankle, menstrual cramps and more. Wide mouth is easy to fill and the anti spurt lip prevent water spitting out, leakproof. Fill only to two-thirds capacity maximum for safe. Featuring a lightly matte textured exterior to retain heat longer and prevent slippery, the transparent bottle is for easy observation. With a soft fabric cover to avoid skin burns caused by direct contact with the water bottle. Specification: Material: PVC(Polyvinyl Chloride) Size(LxW): Approx. 24.8 x 14.8cm/9.76 x 5.83inch Capacity: 1000ml/33.82-35.20oz Package Includes: 1 Piece Hot Water Bag with Cover Note: The hot water bottle should be replaced after two years of use. Always test the stopper for leakage before use. There may be some odor of hot water bottles on first use, you can put it in water for hours to remove odors. Pls do not touch skin directly after hot water is injected to avoid scalding, use it safely with suitable temperature.