The Extreme 40 (X40) is a class of sailing catamaran created by TornadoSport and designed by Yves Loday. Built by Marstrom Composites of Sweden these boats are 40 feet long and constructed of carbon fibre. They have a top speed of about 40 knots (46 mph) and can sail at about 35 knots (40 mph) in 20–25 knots of wind. The first extreme 40 was launched in 2005. They were sailed in the Extreme Sailing Series, formerly known as the iShares Cup. Extreme 40's are essentially a scaled-up Olympic class Tornado with more aggressive and performance orientated lines.
The mainsail is 75 square metres (810 sq ft) and the jib is 25 square metres (270 sq ft).
The gennaker used for downwind sailing is 110 square metres (1,200 sq ft).
This particular boat has been raced under many auspicious names including Ecover, J P Morgan and most notably ETNZ (Emirates Team New Zealand)