A fast, locked in fin with a super quick release of the wake. FIN-S 2.0 MOUNTING SYSTEM We have partnered with Fin-S on a proven and simple tool-less fin attachment. Using Spring Lock Technology, with an intuitive 2-stage engagement and removal. *Not interchangeable with Button Fins RIDING STYLE The sensation of hitting the gas pedal without spinning the tires. The Flo-Thru fin was designed for increased speed and less drag without sacrificing traction. Up your flow with the new Flo-Thru fin. A carbon epoxy lay8up also makes them our stiffest, most responsive construction. CONSTRUCTION A carbon epoxy layup also makes them our stiffest, most responsive construction.AVAILABLE ON Any surfer using a Fin-S fin box system. SIZES 3.5" & 4.5" in both Left & Right options. Compatible with all Fin-S Fin surfers.