The vacuum-sealed wonder cup that just doesn’t quit from Corkcicle. Keeps any cold beverage ice cold for 9+ hours, even in the sun. 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. Hand washing with a mild dish soap is recommended.