Patent ID: 7527540

Claim:
A swim fin having a first end, a second end opposite the first end, a right side and a left side extending between the first and second ends, and a propelling blade with a hydrodynamic flex control framework, comprising: a) a foot pocket sized to receive the foot of a user, the foot pocket with an open heel section, a closed toe section such that the ball of the user's foot is positioned between the open heel section and the closed toe section; b) a propelling blade with a hydrodynamic flex control framework further comprising; a. a left side living hinge and a right side living hinge secured on opposite sides of the foot pocket between the open heel section and the closed toe section in close proximity to the ball of the user's foot allowing the axis of bending for the blade to be located in close proximity to the ball of the user's foot; b. a blade section extending from the left side living hinge and the right side living hinge, the blade section extending forward of the closed toe section to form an opposing fin configuration at the second end of the fin; c. a relief jet aperture is positioned between the blade section and the outer periphery of the closed toe section of the foot pocket and the living hinges allowing the living hinges to have an axis of bending in close proximity to the ball of the user's foot without interference from the closed toe section of the foot pocket.