Keeping water cold is easier than ever thanks to this innovation from Finland. The carafe is beautifully designed and made from modern cooling ceramics. Submerge the carafe in cold water for 60 seconds and the vessel will keep its contents cool for up to four hours. As the water evaporates, the carafe retains its chill, getting even colder if left in the open air. The exterior is matte black, serving as a go-to chalkboard for fun messages or labeling in chalk.