Overview Designed for fast, critical surfing. The upright, pivotal side fin template produces quick start-up acceleration and allows for tight turns in the pocket. Based on the FCS K2.1 template. Quad (4 fin) set.   Ideal Conditions Hollow steep waves, punchy beach breaks.   Board Types All board types. Will fit the FCS II Fin System when used with grub screws and the FCS Infill Kit. Performance Core Performance Core (PC) fins are made using a multi-layered resin transfer molding process. The flex pattern in PC fins extends progressively from the base through to the tip, helping the surfer to maintain drive and hold through a turn. This versatile fin material is light, and can be used in a variety of different conditions. Size: X-SMALL (Under 55Kg / 120 Lbs)SMALL (55Kg - 70Kg / 120 - 155 Lbs)MEDIUM (65Kg - 80Kg / 145 - 175 Lbs)LARGE (75Kg - 90Kg / 165 - 200 Lbs)X-LARGE (Over 85Kg / 190 Lbs)