Designed by Al Merrick for radical, progressive surfing, the FCS II Al Merrick PC AirCore Tri-Quad Fin Set blends raked side fins for speed and drive with a smaller center fin on the medium and large templates for quick release through turns. Built with updated Performance Core construction and ultralight AirCore, the five fin setup excels in hollow, steep waves and punchy beach breaks, pairing best with performance boards featuring deep concaves and moderate to extreme rocker.
Fin Size Detail
| Size | Fin | Height | Base | Area | Sweep | Foil |
| Medium | Side | 4.53″ | 4.57″ | 14.89″² | 36.6° | Flat |
| Center | 4.41″ | 4.33″ | 13.72″² | 35.0° | Flat | |
| Q-Rear | 3.99″ | 3.83″ | 11.05″² | 32.4° | 80/20 | |
| Large | Side | 4.69″ | 4.61″ | 15.63″² | 36.3° | Flat |
| Center | 4.45″ | 4.47″ | 14.68″² | 38.6° | 50/50 | |
| Q-Rear | 4.26″ | 4.09″ | 12.63″² | 32.4° | 80/20 |
