Fcs Mens M Yellow FCS II Carver GF Medium tri fin set. Fin setup: tri fin. Fin system: FCS II. Elongated fin for performing long arc turns. High degree of sweep angle provides exceptional control off the bottom and when carving on the open face. Designed for power surfers who like to push hard against their fins and draw out their turns. Ideal Conditions: Open face, down-the-line waves, particularly good in point and reef breaks.