High Quality - The upgrade version hot water bottle is made from food grade silicone, odorless and recyclable. Wide mouth design, easy to fill up water. Knit Cover - There is a soft knit cover to prevent the hot surface from being in direct contact with your skin to cause burns. Microwave oven Available - Can be heated by microwave oven, take off the knit cover and fill in cold water, the heating time is 2-3 minutes and the heating power should be not over 1500W. Ice Bag Function - Fill with cold water then put it into refrigerator, you will get a ice bag. The silicone water bag can be used as a cold compress for pains, sports injuries, fever and reduce swelling. Best Gift - It is the best gift for friends or families, the hot & cold water bottle can be used in different seasons. It can keep you warm in cold days, it also can be used as an ice pack.