U-shaped hot water bottle with cover: This U-shaped hot water bottle is made of flexible rubber with a fleece cover, making it comfortable to carry. It can hold 1 liter of water, but we recommend that you fill it only 2/3 of the way full. This will help prevent water from spilling and gives the water room to spread out while it is being used. [Warm Pain Relief] -- Using a hot water bottle or pain relief bag is a common remedy for relieving neck and shoulder pain. The shape helps you easily mold the pouch where you need it most, treat sore muscles, cramps, arthritis, aches and pains, migraines, stiff necks, lower back pain, menstrual cramps, stress, and slight detumescence from injuries. DURABLE AND ENVIRONMENTALLY FRIENDLY: The bottle is under the safety standard for pain hot packs, which means it is leak-proof and durable. The bottle and sleeve are vegan and safe for babies and children. Caution: An adult should always supervise and never fill with boiling water. Easy to use: wide mouth design, fill the water bottle more easily and reduce the risk of burns. Strong screw cap ensures no water leakage after tightening. When you're done using the bottle, drain it completely and store it in a cool, dry, dark place until you need it again. [Winter Choice]: Best warm choice for winter travel, camping, hiking or other outdoor activities, protect your hands or other exposed skin from freezing. Comes with a soft hot water sleeve to avoid direct skin contact with the hot water bottle to cause burns.