FlexCore: Large Five FinDESCRIPTION SPECS TRIAL PERIOD AND SHIPPING An all round fin template and our best seller, this is the go to set up for surfers who want reliable performance in all surf conditions. Our FlexCore Series offer a responsive, lightweight fin with a moderate flex to give you a combination of speed and manoeuvrability with flow between turns. Suitable in a wide range of conditions from beach breaks to point breaks. Five Fin sets come with a Thruster (3 fin)