Foils are similar to sleds, but lack any sort of frame. They are dual skin kites - air enters between the skins at the front of the kite and inflates the kite. Careful design means that the kite then takes on a shape and profile very similar to a wing. This generates a lot more lift than a usual single-skinned kite. Most foil kites have bridles with lots of 'legs', similar to the shroud lines of a parachute. Foils are also known as parafoils and flowforms, especially if they have been designed to resemble other objects. Famous flowforms include the giant kites of New Zealander Peter Lynn. He has produced trilobites, octopi and geckos the size of trucks and houses.