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 comprising an interchangeable blade having at least two longitudinal tabs along the longitudinal perimeter edges thereof, a shoe provided with at least two longitudinal members which extend forwards from the two opposite sides of the shoe, each of the longitudinal members having a longitudinal groove for a removable engagement with a corresponding one of the tabs, wherein the longitudinal groove extends up to a front end of the longitudinal member, wherein each of said longitudinal members has a front terminal made of a more rigid material than the remaining part of the longitudinal member and configured for a shape and force coupling with a corresponding one of the tabs.

An arm extension apparatus comprising a propulsion blade comprising a top half and a bottom half, wherein the top half is generally straight and wherein the bottom half comprises a curve, and wherein the bottom half comprises a proximal end and a distal end, and wherein the distal end comprises a foot, and wherein the foot comprises two split toes.

Provided is a functional shoe comprising a shoe body, a flipper member extended in a plate shape from an end of the shoe body to be used as a flipper function and deformed upward to be folded so as to cover an upper surface of the shoe body, a fixing part fixing the flipper member, and a strap closely adhering the shoe body to a rear part of a user's foot, wherein the strap is selectively folded or unfolded to adjust a contact area with the user's foot. Accordingly, a shoe function and a flipper function are applied to one shoe to be conveniently used, a contact area with the user's foot may be increased to prevent the shoe from coming off when used in the water, and the strap may be folded to increase convenience outside the water.

The present invention discloses a swim fin, including an outsole, a middle sole and a shoe upper sequentially provided from bottom to top; wherein the shape and size of the outsole match the shape and size of a human foot, the outsole is a rubber outsole made of a rubber; the middle sole includes a support part matching the shape and size of the outsole, and a webbed paddling part extending outward along a peripheral of a sole part of the support part; the middle sole is a polyurethane middle sole made of polyurethane; the shoe upper is formed by sewing diving suit fabric; and the middle sole is integrally formed by an upper-containing injection moulding process using the polyurethane, the middle sole is respectively connected to the shoe upper and the outsole during the integral forming process of the upper-containing injection moulding process.

A disclosed diver fin includes a blade and a foot pocket, distinct from one another and releasably connected to one another by one or more rails extending from a leading edge of the blade to the foot pocket. The rails extend from either side of the foot pocket and extend parallel to one another at least partway along the length of the blade towards a trailing edge of the blade. Each rail includes two sections: a first rail section, extending from the leading edge of the blade and terminating in a free end, and a second rail section, extending from the foot pocket and terminating in a free end. The free end of one rail section includes a female recess, and the free end of the other rail section terminates in a male extension, slidably receivable in the female recess. The disclosed fin is reconfigurable to accommodate different diving conditions.

A diving flipper (10) for propulsion in water, comprising a shoe part (100) for receiving a foot of a user, and a flipper part (200) having two ribs (210) and a blade (220) fastened to the ribs (210), wherein the ribs (210) are arranged on both sides of a median plane (M) of the diving flipper (10), and each have dorsal and plantar edges (250, 251) in the transverse direction of the ribs (210) and distal and proximal ends (260, 261) in the longitudinal direction of the ribs (210), and fastening devices (300) for fastening the ribs (210) to the shoe part (100),
wherein the dorsal edge (250) of at least one rib (210) is inclined relative to the median plane (M) of the diving flipper (10), so that the dorsal edges (250) have less of a distance to each other than the plantar edges (251) of the ribs (210) to each other, wherein the ribs (210) elastically deform relative to each other at least in sections in the direction of the median plane (M) of the diving flipper (10) in the event of an external application of force to the flipper part (200) in the plantar direction.

A swim fin or pair of fins, and method of providing omni directional thrust propulsion during a swimmer/users, power cycle relative to range of motion, that may comprise of, elastomeric flexible to rigid and/or composite materials, a leg bracket, accompanied by leg strap, ankle strap, and attaching hardware, a foot pocket comprising a plurality of pressure entrapment orifices, and fixably attached orifice flaps, disposed dorsally about a foot pocket, a fin blade extending outwardly of said foot pocket, comprising a plurality of fin blade orifice, fixably attached orifice flaps disposed about said fin blade. Sockets, with attaching hardware, disposed about the edges of said fin blade, having removably attached articulating socketed and non-socketed jointed members that extend along the medial to lateral edges as well as anteriorly from said fin blade edges, articulating members may include, integral joint sections having separately assembled internal hardwares, along with corresponding removably attached cable/tendon hardware, which is routed from said lower leg bracket, internally through the fin blade body, to the interior of said socket sections, and removably attached to articulating members, outwardly about the swim fin assembly, a swim fin may further include a fixably attached webbing comprising of thin flexible materials, disposed between said articulating members and fin blade edges, for a uniquely improved method of hydrodynamic pressure entrapment, for the advantage of uniquely increased angle of attack propulsion method for a given user in water.

The invention relates to an aquatic shoe consisting of a shoe body (1), a pair of wings (3) and floats (4, 4′), characterized in that the wings (3) are symmetrical, glued together, and linked to the shoe body (1), below the shoe, so as to constitute a part of the sole (2) of the shoe, and in that the float (4) is integrated below the wings (3), at the sole (2), so that one of its faces covers the sole (2), and in that the wings (3) are fixed by a pivot connection on both sides of the shoe, so that they descend when the foot ascends into the water and rise when the foot goes down into the water so that they return to their original position. The invention also relates to the use of footwear in the fields of recreational water and/or sport and in the paramedical fields. The shoe according to the invention can be used for the rehabilitation of animals.

A swim fin or pair of fins, and method of providing omni directional thrust propulsion during a swimmer/users, power cycle relative to range of motion, that may comprise of, elastomeric flexible to rigid and/or composite materials, a leg bracket, accompanied by leg strap, ankle strap, and attaching hardware, a foot pocket comprising a plurality of pressure entrapment orifices, and fixably attached orifice flaps, disposed dorsally about a foot pocket, a fin blade extending outwardly of said foot pocket, comprising a plurality of fin blade orifice, fixably attached orifice flaps disposed about said fin blade. Sockets, with attaching hardware, disposed about the edges of said fin blade, having removably attached articulating socketed and non-socketed jointed members that extend along the medial to lateral edges as well as anteriorly from said fin blade edges, articulating members may include, integral joint sections having separately assembled internal hardwares, along with corresponding removably attached cable/tendon hardware, which is routed from said lower leg bracket, internally through the fin blade body, to the interior of said socket sections, and removably attached to articulating members, outwardly about the swim fin assembly, a swim fin may further include a fixably attached webbing comprising of thin flexible materials, disposed between said articulating members and fin blade edges, for a uniquely improved method of hydrodynamic pressure entrapment, for the advantage of uniquely increased angle of attack propulsion method for a given user in water.