A clay refrigerator, also known as a zeer pot or pot-in-pot refrigerator, is a traditional and eco-friendly cooling device used to keep food and beverages fresh for a longer period of time without the need for electricity.The refrigerator consists of two clay pots of different sizes, one placed inside the other, with a layer of sand or soil in between them. The larger pot is filled with water, and the smaller one is used to store the food or beverage that needs to be cooled. The water in the larger pot evaporates through the outer surface of the pot, which cools down the inner pot and the contents inside it