Cappuccino is a coffee-based drink prepared with espresso, hot milk, and steamed milk foam. A cappuccino differs from a caffè latte in that it is prepared with much less steamed or textured milk than the caffè latte with the total of espresso and milk/foam making up between approximately 150 and 180 millilitres (5 and 6 US fluid ounces). A cappuccino usually exceeds the height of the cup, making the foam visible above the side of the cup. A cappuccino is traditionally served in a porcelain cup, which has far better heat retention characteristics than glass or paper. The foam on top of the cappuccino acts as an insulator and helps retain the heat of the liquid, allowing it to stay hotter longer.