Futures Mark Richards 2+1 Surfboard Fins - BlueThe MR Twin+ 1 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 1 to 6 feet. "Being pure foiled