2 strong magnets sewn into a leather-like pouch on 1 side of the coolie. Neodymium magnets keep your drink secure to metal surfaces, even when the can is full. Made of 1/8" (thickness) neoprene (wet suit) material. Built to fit regular (traditional) size 12 oz. cans. Collapsible bottom, folds flat for storage. Helps prevent surface damage by limiting condensation. Keeps drinks colder longer and hands dry. Design is a durable, high quality heat transfer; Printed on 1 side.