Ice Water Bottle: The hot water bottle is easily transformed into an "ice water bag", resistant to cold temperatures of 40C. Fill it with 4/3 of cold water and refrigerate it for physical cooling and cold compresses for bruises.Microwaveable: The hot water bottle is microwaveable. Fill it with cold water and microwave it directly, eliminating the need to boil water.Portable: The warm water bag pouch is lightweight and portable for everyday use, perfect for the car, desk, home and travel bag.Perfect Gift: The hot water bottle bag can be used as a gift for a loved one, friend, parent, daughter, Christmas, birthday, Mother's Day, New Year's Day, Thanksgiving and more.Note: The silicone hot water bottle can be filled with hot water at around 80C. 2/3 of the water volume is best.