Mitticool Water Bottles are revolutionary eco-friendly. The Clay Water Bottles are hand-made using a unique mixture of 100% natural clay, resulting in water's natural cooling. Mitticool Water Bottle is a revolutionary self-cooling bottle with Eco-Friendly Terracotta ware. It's self-cooling and easy to clean & refill. Clay adds a unique flavor to water. (https://pushmycart.com/collections/mitticool-water-bottle)