RS:X is a windsurfing class selected by the ISAF to replace the Mistral One Design Class for the 2008 Summer Olympics. The discipline has similarities to Formula Windsurfing - mainly in that the equipment used was designed to allow windsurfing in low and moderate wind conditions with good performance. The RS:X seems to be a compromise between traditional raceboards which work well in 5 to 35 kn (3 to 18 m/s), and Formula boards which go fast in 12 to 30 kn (5 to 15 m/s), and has shown itself to be competitive with past raceboards in the medium wind range.