 The only change came in the form of a new graphical design on the upper, which was designed to make the boots even more visible on the pitch.Whilst many players were seen training and playing in the new Mercurial Vapor boots in the preceding weeks, the Mercurial Vapor Superfly III received its official on-pitch debut on 19 March 2011, when Cristiano Ronaldo and Mesut Özil played in the Madrid derby.Both of these football boots were released for retail on 1 April 2011.