Futures Mark Richards Twin + 1 Fin SetThe Futures Fins Mark Richards Twin + 1 Fin Set set combines the best performance features of a twin fin and a thruster. Pure twin fins are fast, loose, highly maneuverable, and responsive, and the addition of a small stabilizer fin adds an extra degree of drive and control. The large side fins from this set are big enough to be ridden in a pure twin fin configuration and will work in virtually any size or shape board in an optimum surf size range of