Captain Fin Co. Eithan Osborne Heart ST

These are designed as a thruster set, meaning they work best on boards with a three-fin box configuration. They are versatile enough to handle everything from punchy beach breaks to cleaner point breaks.

The solid fiberglass construction creates a very stiff flex pattern. This provides a stable, predictable feel that holds well through turns, which is ideal if you prefer a fin that doesn't flex or whip out under pressure.

The slightly smaller center fin is a deliberate design choice to help with pivot and release. It allows the board to break free from turns more easily, giving you a snappier, more responsive feel without losing the drive provided by the larger side fins.

These fins are specifically designed for the Futures fin system. If your surfboard has Futures boxes, they will fit perfectly; they are not compatible with FCS or other fin box systems.

While these fins are high-performance, their stiff fiberglass construction and specific template are generally better suited for intermediate to advanced surfers. Beginners might find the stiff flex less forgiving than a more flexible composite fin.