High-performance yachts, including the International C-Class Catamaran, have used or use rigid "wing sails", which perform better than traditional soft sails but are more difficult to manage. A rigid wing sail was used by "Stars and Stripes", the defender which won the 1988 America's Cup, and by "USA-17", the challenger which won the 2010 America's Cup. "USA 17"'s performance during the 2010 America's Cup races demonstrated a velocity made good upwind of over twice the wind speed and downwind of over 2.5 times the wind speed and the ability to sail as close as 20 degrees off the apparent wind.