FCS II Fins Modern Keel Twin Fin Set - Black

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Twins call for a little something special to work their magic, and the FCS II Modern Keel Twin Fin Set is the answer. This upright keel template was designed for twin fin boards and traditional fish shapes and allows the rider to make tight radius turns, quick pivots and instant redirection. Offering a sweeping, high surface area and a wider base than most conventional keels, the Modern Keel Twin Fins use their elongated shape for extra control and maximizing speed. Take out the Modern Keel and see what new lines you can draw.


Performance Glass (PG) material characteristics and flex pattern are identical to traditional fiberglass fins offering a stiff base with subtle responsive tip flex, amazing aesthetics and proven durability. PG fins are the perfect transition fin for surfers moving from fixed fins to the convenience, accuracy and performance of FCS.

Tech Specs

  • Base: 4.61 in, 117mm
  • Depth: 5.50 in, 139mm
  • Area: 25.05 sq in, 16160 sq mm
  • Sweep: 39°
  • Foil: Flat with bevel on leading edge


  • Size: X-Large
  • Fins in set: 2
  • Material: Performance Glass


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Returns are easy! We understand that in some situations returns or exchanges may be necessary. We also want you to be stoked on your purchase. If you are not 100% satisfied with your purchase you may return it for a full refund, or exchange within 30 days of receiving your order. Items must be in new condition with original tags and packaging.

Please make sure your wetsuit fits before taking it in the water. We are not able to take returns or exchanges on used wetsuits.

Please reference our full Return Policy.

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