Abstract: A swim fin (10) having a foot-pocket formation (12) and a fin blade (14). The foot-pocket formation (12) defines a foot-receiving cavity in which a foot can be received. The fin blade (14) comprises a frontal blade portion (30) and a pair of side blade portions (32.1 and 32.2). The frontal blade portion extends longitudinally from a toe end of the foot-pocket formation and has a predetermined length and is spaced a predetermined height above an underside of the foot-pocket formation, which permits a wearer to walk unimpeded while wearing the swim fin. Each side blade portion includes a fixed blade section (36) and a flap formation (38) that is hingedly displaceable relative to the fixed blade section so as to change an edge profile of the fin blade, in use, for increasing the surface area of the fin blade during a propulsion stroke and decreasing the surface area thereof during a return stroke.

Abstract: A swim fin (10) having a foot-pocket formation (12) and a fin blade (14). The foot-pocket formation (12) defines a foot-receiving cavity in which a foot can be received. The fin blade (14) comprises a frontal blade portion (30) and a pair of side blade portions (32.1 and 32.2). The frontal blade portion extends longitudinally from a toe end of the foot-pocket formation and has a predetermined length and is spaced a predetermined height above an underside of the foot-pocket formation, which permits a wearer to walk unimpeded while wearing the swim fin. Each side blade portion includes a fixed blade section (36) and a flap formation (38) that is hingedly displaceable relative to the fixed blade section so as to change an edge profile of the fin blade, in use, for increasing the surface area of the fin blade during a propulsion stroke and decreasing the surface area thereof during a return stroke.