Jimmy Lewis SuperFly FDT (Foil Drive Assist Compatible) Foil BoardThe SuperFly FDT is the exact same board shape as the SuperFly FD. The only difference is the trench to accommodate the Foil Drive Gen 2 and other Foil Drive units. As well as Foil Drive Gen 2, it also will accommodate the Manta unit. Although the volumes of these sizes are a few liters less than the original SuperFly FD boards, in the water and when the board is in use there is no difference that can be noticed. Volumes: 47 x 18" 40 liters 411 x 19"