Flat White consists of a double espresso (50 ml/1.5 fl oz) and about 130 ml (4 fl oz) of steamed milk with a 5 mm (0.25 inch) layer of microfoam.According to a survey of industry commentators, a flat white is a shorter drink with a thin layer of microfoam (hence the 'flat' in flat white), as opposed to the thick layer of foam on the top of a cappuccino.The beverage usually features a pattern (latte art) on the surface.Latte art Is the different types of design the coffee can be presented to make it more appealing.