This tumbler has a Puramic™ ceramic lining so as not to interfere with your coffee's flavor. The smooth ceramic interior coating preserves the taste of your drink, while the vacuum-insulated stainless steel exterior keeps beverages hot all day long. The leak-proof, pop-open lid is easy to use, and fits snugly into the ceramic lining. At 12 Oz., it fits comfortably into any standard cup holder. The tumbler is dishwasher safe, but print color may fade with dishwasher use.