Vacuum insulated: 12 oz. tumblers are double walled and vacuum insulated, which keeps your favorite beverage hot or cold for hours. Easy to carry with you on the go! Fits most cup holders: The shape of all classic tumblers will fit normal sized cup holders. BPA free lid- The eco-friendly lid is completely BPA free; silica gasket seals to achieve maximum spill proof capability. The splash-proof sliding cover, straw friendly.