Beverage bottle with multi-layer walls of temperature-retaining materials, including copper. Keep drinks warm for 12 hours and call for 24 hours. The cork is shaped like a bell. Turn and set the time you fill the bottle, so you'll check the approximate temperature during the day. Press the cork to loosen the vacuum before unscrewing the cork. Large opening which makes it easy to add ice cubes. The bottle is not intended for carbonated drinks. It can be washed in a dishwasher. The cork is rinsed in water.