The H4 looks and surfs different to any other fin. Precision Swiss engineering matched with a highly evolved template provides an unprecedented level of control and predictability at high speeds. Every component of this fin has been engineered to create a simple synergy between the fin & the surfboard, the rider & the wave. The Lower section produces maximum acceleration, while hatchet like tip creates stability & control. Its highly raked elliptical outline reduces drag, and offers feeling of predictability when releasing through turns. Then the thicker base with tapered tip optimises flex & regulates the release of energy during rail to rail transitions. This fin is recommended for performance shortboards with a moderate-to-low rocker. Please also note: this fin is designed to fit the FCS II Fin System.