The F series unique, strong, ultra light fiberglass construction delivers a performance fin for surfers who feel a little too much flex in composite fins & not enough in Carbon Lights. The progressive engineered flex is complemented by optimized asymmetric foil sections for maximum hydrodynamic efficiency. It has more speed, better response, increased acceleration. More hold & drive through carving turns & more fluid rail-to-rail. Small to larger surf, point breaks, reefs & beach breaks...we've got you covered.