Abstract: A foot strap system for surfboards that allows the surfer to lie upon the strap in a prone paddling position without discomfort yet allows the easy insertion of the foot as the surfer stands. The system comprises a collapsible foot strap having an integral, arch shaped, resilient reinforcement and a surrounding pad which creates a recess into which the strap will collapse. The body of the strap is wide relative to its thickness. The flat, curved reinforcement member within the body of the strap imparts to the strap a curved shape. The reinforcement is sufficiently flexible to allow the strap to be substantially flattened, yet resilient enough to return the strap to its naturally curved form. When mounted to the surfboard, one end of the strap is secured with its curved, reinforced portion very near the mounting to create a flexible "hinge" with sufficient rigidity to hold the strap in an upright "open" position.

Abstract: A fin for a sailboard has a pair of high aspect ratio foils disposed in tandem in which the trailing edge of the forward foil is spaced apart from the leading edge of the aft foil. The fin permits high speed and rapid maneuvering without ventilation and stalling by reducing spanwise flow of water and loss of laminar flow at high angles of attack.