A fin blade for free diving or swimming or scuba diving is described, which has a cross section at one end angled about a yaw, or longitudinal, axis relative to the cross section at the other end. The arrangement is such that a lateral line at a proximal end is disposed at an angle relative to a lateral line at a portion spaced from the proximal end. The fin blade is more closely aligned with the ergonomic complexities of the human body, such that during finning the fin blade provides greater comfort and/or propulsion. A fin blade is also described which includes a reinforced zone in one portion of the fin blade, such that one portion of the blade at the distal end is relatively increased in flexibility to provide a catch zone at one portion of the distal end of the fin blade.

An underwater propulsion system is disclosed comprising a foot board with one or more battery-powered propulsion units. A throttle control system may be enabled in the foot board such that a movement of the user's foot controls the throttle. Flattened Lithium batteries allow thin lightweight construction of the foot board. Use of trolling motors as propulsion units provides thrust advantages over pre-existing underwater scooters.

An underwater propulsion system is disclosed comprising a foot board with one or more battery-powered propulsion units. A throttle control system may be enabled in the foot board such that a movement of the user's foot controls the throttle. Flattened Lithium batteries allow thin lightweight construction of the foot board. Use of trolling motors as propulsion units provides thrust advantages over pre-existing underwater scooters.

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.

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 monofin swimming device comprising a skeleton and an outer shell, wherein the combination attaches to a user's feet to assist in propelling the user through the water.

A monofin swimming device comprising a skeleton and an outer shell, wherein the combination attaches to a user's feet to assist in propelling the user through the water.

A first flipper has a base, a deformable fin connected to the base, and a first spreader that imposes a first force on the fin that causes the fin to spread in response to relative movement between the first spreader and the fin caused by a first longitudinal deflection of the fin relative to the base. A second flipper has a fin and a foot coupling portion connectable to a foot holding portion of a boot to couple a foot in the foot holding portion to the flipper. A first system includes the flipper and the boot. Methods of using the flippers, the boot, and the system are also disclosed.

A first flipper has a base, a deformable fin connected to the base, and a first spreader that imposes a first force on the fin that causes the fin to spread in response to relative movement between the first spreader and the fin caused by a first longitudinal deflection of the fin relative to the base. A second flipper has a fin and a foot coupling portion connectable to a foot holding portion of a boot to couple a foot in the foot holding portion to the flipper. A first system includes the flipper and the boot. Methods of using the flippers, the boot, and the system are also disclosed.

Swim footwear having integral flippers and sound generators includes a first shoe comprising a sole that is pliable. A compartment is positioned in an interior space defined by the sole. An orifice, positioned in the sole, is fluidically connected to the compartment. A noisemaker is coupled to the sole within the orifice, such that air passing from the compartment through the noisemaker generates a sound. A shell that is coupled to the sole has an entry proximate to a back end of the sole. The shell and the sole define a cavity that is complimentary to the foot of the user. The entry is configured for insertion of the user's foot. A flipper extends from a front end of the sole. The flipper is in substantial parallelism with the sole. The footwear comprises a second shoe that mirrors the first shoe.