Abstract: A heel mounted reversible fin assembly for propelling kick boats and float tubes in water. The assembly includes a base mounting mechanism (1) which secures the assembly on a user's boot heel, and an inter-connected generally perpendicularly inclined fin member (4) which extends below the user's boot sole. Apertures (52) extending through the fin blade (50) adjacent to cleavages (46) in ribs (47) define a hinge portion (49) about which the blade (50) flexes to feather on return kicks in the direction of the rear surface (48) of the blade (50). Raised ribs (47) extending generally perpendicularly outward from the rear surface (48) of the fin blade (50) inter-connect, providing a stop mechanism to retain the blade (50) in a generally rigid configuration on power kicks in the direction of its front surface (51).

Abstract: A universal foot fin is disclosed for use with float tubes and pontoon boats which can be selectively adapted to propel either forward or backward in the water, while simultaneously allowing the user to walk forward in either adaptation without removing the fin assembly. The fin assembly is described as being either (in simplest form) a separate FIN member to be attached to mounting fixtures which can be permanently affixed to or molded integral on wading boots, or as a complete assembly including a base member to be secured to wading boots by an releasable binding mechanism In use the fin member pivotally retracts in an upward position for walking.