There is something special about drinking coffee or tea from a proper mug. That could pose a problem though if you wanted to start the coffee at home and then take it to work or on your morning commute. The Ultimate Coffee Mug gives you a classic tumbler combined with the unique features of a travel bottle. Real Ceramic Coating The ceramic coating in this mug gives the cup a unique advantage over the other stainless-steel mugs. Drinking from ceramic ensures your coffee or tea keeps its pure taste with no plastic or metal aftertaste. Double-wall Vacuum Insulated Exterior The Asobu Ultimate Coffee Mug is encased in stainless steel to ensure durability. Enjoy the full insulation of a regular thermos thanks to the vacuum copper-insulated exterior. This insulated mug keeps your drinks hot (or cold) for approximately three hours, and the double-wall insulation protects your hands from the heat or chill of your beverage. Adjustable Lid + Easy-Hold Round Handles Complete with an adjustable, spill-proof lid and an easy-hold round handle makes this the ideal mug for at home or on the go. This 12-oz. mug holds the perfect amount of coffee or tea, making it a great mug for the office, camping Is this mug dishwasher safe? No, the Ultimate Coffee Mug is not dishwasher safe and must be hand washed. Does the mug fit in car cup holders? It depends on the car, but unfortunately, the Asobu Ultimate Coffee Mug doesn’t fit in most car cup holders. The diameter of the mug including the handle is 5".