Captain Fin Co. Keel Fin

These fins are designed specifically for the FCS Original fin system. If your board uses the standard two-tab FCS Original setup, these will be a direct fit.

The stiff fiberglass construction provides a very stable, predictable feel. It minimizes flex, which helps you maintain speed and drive through turns rather than losing energy in softer, more flexible fins.

These are classic keel fins designed for retro twin-fin shapes and open-face carving. While they offer excellent drive and hold, they are built for smooth, drawn-out arcs rather than the quick, vertical snaps typical of modern high-performance thrusters.

Keel fins excel in clean, open-faced waves where you can utilize their wider base to generate speed and hold a line. They are ideal for point breaks or long, rolling waves where you want to cruise and carve.

A keel fin has a larger surface area and a wider base compared to standard twin fins. This design provides significantly more hold and drive, making it the preferred choice for retro fish shapes that rely on speed and flow.