The MB project objective has been to renovate our medium-high range of fins featuring carbon fiber blades.

At C4, the 200 series fins are considered the most technical while we think these MB fins are our best interpretation of the concept of traditional carbon fiber fins.

Despite a reduced weight, having such a solid foot pocket on which to apply the blades has proven to be an ideal solution to increase performance.

In MB fins, the major factor that increases performance is the new dedicated “Reverse Parabolic” lamination; a parabolic curvature which, instead of having the part with greater flexion at the top, it is near the foot. A complete reversal of concepts and an evolution of what our DPC (Double Parabolic Curve) blades had.

This dedicated lamination significantly changes the mechanical behavior of the fin. The surface that generates the thrust is in fact greater than the surface that generates hydrodynamic resistance, thus producing greater elastic deformations and greater propulsion. The fin becomes a natural extension of the leg and not just a simple mechanical appendice on which to exert force.

There is such a big advantage that it is possible to use stiffer blades, therefore with greater performance, but using the same effort normally used with lighter blades.

Taking advantage of this feature we have raised the relative performance. A “+” has been added to the hardnesses. This is because, flexed in the hand, an MB 25+ is stiff and pushes as much as a standard 30 while weighing in the water like a 25. Restarts from the bottom, accelerations and speeds are thus higher.

MB fins feature new rounded section water rails that improve water containment on the blade and reduce water vortexes on the outer sides. The water rails, introduced by C4 for the first time in 1993, have always kept the water on the parts of the blade that generate the thrust. The MB feature a greater thrust surface and, for this reason, the water rails are integral, from the foot pocket to the tip of the blades.

Without footpockets like the 250 none of this would have been possible. As always, it is the combination of footpockets and blades that produces the result.

The carbon blades all feature a matte surface finish.

MB fins are named after their creator: Marco Bonfanti, who wanted to personally sign his new fin project featuring the “Reverse Parabolic” curved blades.

Specs:

• Dimensions blades: 874×195 mm
• Dimensions blade + footpocket 42/43: 980×195 mm
• Carbon Material: T700 Carbon Fiber
• Hardness: 20+ ExtraSoft / Soft, 25+ Soft / Medium, 30+ Medium / Medium Hard
• Color Water Rails: Black
• Water Rails: Rounded section water rails
• Footpocket: 250