Abstract: An improved diving fin includes a first web surface and a second web surface. The first web surface extends between a pair of first longitudinal flukes, and the second web surface extends between a pair of tapered second longitudinal flukes. The first longitudinal flukes and the tapered second longitudinal flukes are connected at their respective rear ends. A plurality of transverse adjusting flukes are separately coupled to each of the first longitudinal flukes and the tapered second longitudinal flukes at the rear ends. Any number of the transversal adjusting flukes can be selectively severed so that a diver can change the swinging length of the second web surface according to personal needs.

Abstract: An improved diving fin includes a first web surface and a second web surface. The first web surface extends between a pair of first longitudinal flukes, and the second web surface extends between a pair of tapered second longitudinal flukes. The first longitudinal flukes and the tapered second longitudinal flukes are connected at their respective rear ends. A plurality of transverse adjusting flukes are separately coupled to each of the first longitudinal flukes and the tapered second longitudinal flukes at the rear ends. Any number of the transversal adjusting flukes can be selectively severed so that a diver can change the swinging length of the second web surface according to personal needs.

Abstract: Improved diving fins in which a flexile second web surface is disposed at the approximate center portion of a longitudinal web section. As such, when the diver articulates both legs rearward and downward for aquatic kicking by posterior extension, the second web surface is automatically displaced forward by the force of water resistance and then reverts to a nearly perpendicular angle as the rigidness of the first web surface follows in coordination during the kicking sequence, with the power articulated by the legs not only capable of kicking efficiency that produces a maximum reactive force (thrust) and increases diver speed, but at the same time also allows for a reduction in kick rate and effectively delays the onset of diver fatigue.