The 4-in-1 Stainless Steel Can Cooler boasts a double-walled vacuum insulation technology, to offer four distinct functionalities. These include being an insulated tumbler, a 12-ounce can cooler, a slim can cooler, and a bottle cooler. The included insulator ring efficiently maintains the temperature of cans and bottles, keeping them chilled for up to 4 hours. When utilized as a tumbler, it preserves the warmth of hot beverages for 3 hours or keeps cold drinks chilled for as long as 9 hours.