The F1 cars for the 2009 season came under much questioning due to the design of the rear diffusers of the Williams, Toyota and the Brawn GP cars raced by Jenson Button and Rubens Barrichello, dubbed "double diffusers". Appeals from many of the teams were heard by the FIA, which met in Paris, before the 2009 Chinese Grand Prix, and the use of such diffusers was declared as legal. Brawn GP boss Ross Brawn claimed the double diffuser design as "an innovative approach of an existing idea". These were subsequently banned for the 2011 season. Another controversy of the 2010 and '11 seasons was the front wing of the Red Bull cars. Several teams protested claiming the wing was breaking regulations. Footage from high-speed sections of circuits showed the Red Bull front wing bending on the outsides subsequently creating greater downforce. Tests were held on the Red Bull front wing and the FIA could find no way that the wing was breaking any regulation.