Foil Kite:
Foil kites are soft kites based on the design of the parafoil. Consisting of a number of cells running front to back and which some or all of these "cells" are open at the front to allow air to inflate the kite so it creates an aerofoil shape.
Because of the amount of lifting power that these kites often create, they are often used for a number of different kiting activities. These include recreational kiting, kite buggying, kitesurfing, snowkiting, and kite boarding.
Foil kites when flown use either 2, 3 or 4 lines and a bar; 2 lines and rings or wrist bands; or 4 lines and handles.
To make them more usable for use on or over water, some foil kites have fewer air inlets in the center of the leading edge of the foil. These valves keep the air in and (ideally) and the water out - which would of course sink the foil.
Internal holes in the cell sides allow the whole kite to inflate. These kites are naturally slower to inflate than an open fronted foil.
Foils are the most aerodynamically efficient of all the power kites, because the aerofoil section provides significant lift when flown stationary overhead, unlike leading edge inflatable kites.