This 20 oz maroon polar camel tumblers features double-wall vacuum insulation. The mug has a narrower bottom to fit most standard cup holders. It is 2X heat & cold resistant compared to a normal tumbler. It is pre-engraved with the USA flag in the design of lips. It is NOT recommended for dishwashers, hand wash only. The prolong exposure to a dishwasher breaks down the materials used to keep your beverages hot & cold for hours.