Captain Fin Co. Keel Fin

These fins are compatible with the FCS Original two-tab fin system. Please double-check that your board uses this specific system before purchasing, as they will not fit Futures or other box types.

The stiff fiberglass construction minimizes flex, which provides a more stable and predictable feel. This is ideal for maintaining speed and drive through turns, especially when you are pushing hard on the rail.

These fins excel in open-face waves where you can draw out long, smooth arcs. Their design prioritizes speed and flow, making them a great choice for down-the-line surfing rather than tight, vertical maneuvers.

The wider base provides extra surface area for increased drive and hold, while the swept outline helps the board track smoothly through turns. Together, these features help you maintain momentum and stability on retro-style twin fin boards.

While you technically can, these fins are specifically engineered for the geometry and rocker profiles of retro twin fin boards. They may feel overly stiff or sluggish on a high-performance shortboard designed for quick, snappy turns.