A revolutionary and bold step in freediving fins and fin technology for diving in general. Two separate foot pockets, a Left and a Right, are the most apparent features that put the fins in a category of their own. The second noticeable difference is the lack of supporting rubber ribs on the sides of the blades.

C4 states this allows for the fins to feel as natural as possible on a diver’s feet and thereby reduces the amount of wasted energy through the fin stroke as well as allowing the carbon fiber blades to work naturally.

The diver swims in a very natural kicking position and this eliminates energy loss, conferring it through the fin blades in the most efficient way possible.

The blades are tapered with a parabolic shape in the rubber channels on the side of the fin thereby concentrating and maximizing water flow down the blades optimally through the fin stroke.

The 30 is the best all around stiffness for most divers and freediving to 30 meters (100ft).  Complete with C4’s patended foot pocket system which include laces and are available in five sizes.  Two Year Guarantee.