Foiling. It's not the future. It's now. Once the International Moths went airborne, there was no turning back, and now that a half-dozen catamaran classes have achieved flight status, we can expect to see more as the state of two-hull sailing evolves with lighter platforms, efficient foils and easier flight controls. These are the early days, however, and the barriers to entry continue to be cost, complexity and skill. From the supersize awesomeness of the million-dollar Gunboat G4 to the $36,000 Carbon Nacra F20 FCS, foiling cat sailing still doesn't come cheap or easy.