1Insulation Effect: The hot water bag is easy to fill and the splashproof lip prevents water from splashing like those old rubber bags, the hot water bag is made of premium materials and superb craftsmanship, making the hot water bag have a more durable insulation effect, the U shaped design helps you easily use the bag where you need it most, perfect for staying warm on cold nights. 2Wide Mouth: Wide mouth easy to fill hot water, anti jet lip to prevent water spitting out, up to 2/3 capacity, make sure the hot water temperature does not exceed 85 before pouring, after adding water, check if the lid is tightened to prevent leakage and scalding, hold the neck of the bottle, upright and slowly fill the bottle to prevent hot water from spilling on yourself, screw on the cork when filling 2/ 3Removable Knitted Cover: The knitted cover on this bottle helps you use it as a travel pillow for long bus or airplane trips, where pain episodes can occur at the most inopportune places, so it's an ideal way to provide a soothing experience with a knit cover that prevents the hot rubber from coming in direct contact with your skin. 4Explosionproof and Safe: The hot water bottle is made of premium explosionproof rubber to ensure safety and perfect heat transfer to keep the water warm for a long time, it can hold 1L of water but it is recommended that you fill it only 2/3 of the way, which will help prevent spillage and allocate space for water when in use. 5Pain Relief: Hot water bag can be used as a hot or cold compress for relieving muscle aches and pains, relieving menstrual cramps, sports injuries, etc. It can also be a warm and comfortable gift for friends on Thanksgiving, Christmas and New Year's Day.