New Futures Surf F8 Honeycomb Tri Fin Set Grey Futures F6 Honeycomb Tri Fin Set. Fin Set Up: Thruster. Fin System: FCS. Medium Flex. The F8 Honeycomb is the largest fin in the F-Series. Combining medium flex characteristics with a balanced template to create one of the most versatile fins for large surfers. The F8 provides the perfect amount of drive and hold when on rail.