Editorial Review With the naturally cooling ceramics you're sure to serve all foods, desserts and snacks deliciously fresh, right at the table. Prior to use, just soak the naturally cooling ceramics for 60 seconds under cold water before filling it with your favorite foods. The cooled ceramics will keep contents fresh throughout your meal. The longer the Cooler sits in the open environment, the colder it becomes. To personalize, use chalk to create a special message on the matte Black exterior.