FCS II surfboard fins * Size: Large * Thruster fin setup * Elliptical centre fin * Fin foil template * Designed for FCS II fin system * FCS detailing * Colour: Smoke The H4 Thruster Surfboard Fin set is a unique fin that looks and surfs differently to other fins. It features precision Swiss engineering and a highly developed template, which allows for unprecedented control and predictability at high speeds. The H4’s intuitive performance makes it almost effortless to initiate a turn. The fins will provide speed when you are in need of it and release at the perfect transition point. Although the science behind the template and the materials are complex, each component of the fin was designed to create an easy synergy between the fin, the surfboard, and the rider.