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FOILFoil is the change in thickness of a board from the nose to the tail, or of a fin from the leading edge to the trailing edge. See S deck. More technically, a Foil is a device that provides reactive forces when in motion relative to a surrounding fluid; foils can be accurately described by their chord, camber, thickness, and thickness distribution. Can also refer to curved surfaces of a fin; http://www.swaylocks.com/images/glossary/uploads/finz1.jpg *Note that the center fin is foiled both sides, the side fins are foiled on one side*