One embodiment of improved swim fins consists of a right foot attachment (101) with an outer right blade (111) and an inner right blade (112) which is arranged such that it does not mechanically interfere with an inner left blade (113). The blades may include a pivot mechanism (220) that allows the blades to maintain an optimal angle of attack as the swimmer moves their legs up and down. In another embodiment, a right blade (1011) and a left blade (1013) are attached to the feet of a person who is propelled by the blades above the surface of the water as they pump their feet up and down, forming a human-powered hydrofoil. Other embodiments are described and shown.

A flipper screw includes a lower cover with a screw and a lower cover with nut, and it is used for fixing the web by replacing the anti-slip screw. The upper cover and the lower cover are provided with plural snap portion, which can be snapped in the rib around the screw hole, so as to avoid the web accidentally being released from the flipper.

A water shoe which is comprised of a neoprene, polychloroprene, nylon, polyester or rubber material like upper boot or sock attached to a traction sole and having an elevated swim fin appendage which does not obstruct normal walking motion. The neoprene water shoe with an elevated swim fin appendage allows a user to walk with a normal stride on land and also to enter the water and engage in swimming activities without having to change into separate swim fins.

Embodiments of footwear to optimize propulsion while swimming in the water and walking on land, in particular, amphibious footwear capable of duty on land and in the water as well as versions that are optimized for predominantly use in the water for swimming. The exoskeleton amphibious footwear reduces metabolic demand of walking and swimming while also improving gait speed and swim speed. This is accomplished by assisting plantar flexion during land mode, and assisting dorsiflexion in water mode.

A swimming flipper (1) comprising a foot portion (2) and substantially flat blade portion (3) extending there from, said blade portion (3) having provided on each longitudinal side thereof at least two opposed rails (4/5) extending inwardly and at an angle equal to or less than 90 degrees to the plane of said blade portion (3), and said blade portion (3) having provided at least two ridges (7/8) preferably underneath the blade portion (3) extending longitudinally from the foot portion (2), said foot portion (2) having provided a one-piece strap (6), and said foot portion (2) having provided at least two fixed couplings (11/12) to engage and disengage with the corresponding and opposing couplings of another said flipper portion (1) to interlock and hold two flippers attached to each other.

A pivotable swim fin device includes a footwear element, such as a boot, and a fin element pivotably attached thereto. The fin element is able to be moved between a downward swim position and an upward walking position, thereby enabling the pivotable swim fin device to be used in the downward position for water activities such as snorkeling, scuba diving, etc.; and in the upward position for walking on land unobstructed.

A water footwear adapted for wear on the foot of a user having a fin. The fin is slidable between a deployed position where the fin projects forward from the toe of the water footwear to a retracted position where the distal end of the fin is moved inline or immediately adjacent the toe of the water footwear. With the fin in the retracted position the user may easily walk in a normal fashion. With the fin moved to the deployed position it provides an aid for swimming.

Embodiments of footwear to optimize propulsion while swimming in the water and walking on land, in particular, amphibious footwear capable of duty on land and in the water as well as versions that are optimized for predominantly use in the water for swimming. The exoskeleton amphibious footwear reduces metabolic demand of walking and swimming while also improving gait speed and swim speed. This is accomplished by assisting plantar flexion during land mode, and assisting dorsiflexion in water mode.

A swim fin for wearing on a foot features lateral and medial side fins which do not extend further forwardly past a front end of a shoe portion of the swim fin, which forms a receptacle for receiving the foot. Also, the side fins are spaced from a sole of the shoe portion and located closer to an upper of the shoe portion than the sole.

A swim fin for wearing on a foot features lateral and medial side fins which do not extend further forwardly past a front end of a shoe portion of the swim fin, which forms a receptacle for receiving the foot. Also, the side fins are spaced from a sole of the shoe portion and located closer to an upper of the shoe portion than the sole.