The Gusto Vacuum Tumbler & Slim Can Insulator 350ml is engineered using double-wall, vacuum-insulated construction. This multifunctional on-the-go drinkware doubles as both a tumbler and portable insulator to keep beverages and slim cans chilled. With the Gusto Vacuum Tumbler & Insulator, your drink will stay hot for up to 5 hours or cold for up to 15 hours.