High performance swim fin

A foot-mounted swimming aid comprising:

• a a hollow foot chamber open at the heel having an exterior surface of flexible material of sufficient size to accommodate a human foot and having a ventral lining of soft flexible material and having a series of elongated holes to vent the chamber;
• b a blade portion of flexible material which can be relatively stiffer than the flexible material of said foot chamber and connects to said foot chamber and extends past the foot chamber and broadens and tapers outward toward the end forming a flexible triangular shaped web having thickened support areas along the sides and in the center to add support and tapering downwards towards the end and in between said thickened support areas hollowed-out sections in the shape of curved, elongated slots set at two different angles in the triangular web;
• c a thin layer of flexible material extending from the beginning of the blade portion across the top of the blade generally to the end of the blade and connected to the blade at the thickened support areas creating openings between the side and center support areas and in between said thin layer that goes across the top of the blade portion thereby directing water to the elongated curved slots;
• and
• d a thin strip of added flexible material extending outwardly from each side of the thickened support areas, beginning adjacent to said foot chamber and continuing down each side of said thickened support areas towards the end of said triangular shaped web and can be angled toward the ventral side of said triangular web or toward the dorsal side of said triangular web.