Downwind foiling means foiling longer distances with the wind and swell in one direction. Not just back and forth at a single spot, but several kilometers in one direction. You start with a parawing or SUP paddle, get the board airborne, and then focus on the wave. The wind makes the takeoff easier or brings you back upwind. The wave is your propulsion.
The long, narrow shape is the most efficient design for building and maintaining speed with minimal input. However, this requires good balance and a bit of experience—the narrow standing area is less forgiving of mistakes. What makes it special: A downwinder also works perfectly for super-light-wind sessions in classic wing foiling when you want to wing foil in very light winds.