FCS's advanced Glass Fibre Fusion (GFF) technology. This Swiss-engineered construction, utilising robotic precision automation and premium materials, combines a uni-directional fibreglass skin and a 65% Short Strand Fiberglass + Resin Polymer composite base to produce a fin that’s light with exceptional strength and a responsive flex pattern. For the user, this means an efficient conversion of power into acceleration, seamless rail-to-rail control at high speeds, and a feeling of connectivity between the board and fin.