A fin like you've never seen before. The FCS II H4 Large Tri Fin Set is Swiss engineered, creating a perfect synergy between geometry and HI-FI materials. With two radically different side and center fin templates, the H4s strike the perfect balance of speed, flow, responsiveness and control.

High Density Uni Directional Carbon Fiber – Light & super strong with custom orientation to transfer more of your energy into speed than any other fin.

Precision Swiss Engineered – Creates perfect synergy between fin geometry & HI-FI materials, giving smooth & predictable feel.

Dynamic Trailing Edge – Internal composite morphs under extreme load, enabling the fins to be pushed harder without sliding out.

Side Fins – Base: 4.59" / Depth: 4.57" / Area: 15.84in² / Sweep: 38.3˚

Center Fin – Base: 4.52" / Depth: 4.73" / Area: 15.33in² / Sweep: 37.2˚

Side Fins - Flat Foil – A flat inside face combined with a convex outside face. The traditional flat sided foil offers an even combination of drive, pivot, and hold. Provides a very consistent, reliable feel over a wide variety of conditions.

50/50 Foil – A symmetrical foil used on all centre fins where both sides are convex. Even water flow on both sides creates stability and control.

Ideal Conditions – A wide range of conditions, particularly good in critical overhead waves.

Board Types – Recommended for performance shortboards with moderate-to-low rocker.

Side Fin Profile – Lower section produces maximum acceleration, while hatchet like tip creates stability & control.

Centre Fin Profile – Highly raked elliptical outline reduces drag, and offers feeling of predictability when releasing through turns.

Fin Foils Template – Thicker base with tapered tip optimises flex & regulates the release of energy during rail to rial transitions.

3 Fins