The vacuum-sealed wonder cup that just doesn't quit. Keeps any cold beverage ice cold for 9+ hours - that's two times longer than plastic tumblers. Even in the sun, ice will last 9 hours or longer. Maintains hot beverages for up to 3 hours. The perfect blend of form and function, each tumbler comes topped with a stylish, sip-through, spill-resistant lid equipped with a built-in slider to maintain the perfect temperature in between sips. Triple insulated. Vacuum sealed.