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Jabulani problems a fault of altitude not aerodynamics.

Adidas have rejected criticism from top international goalkeepers Julio Cesar and Iker Casillas that their World Cup ball is too lightweight and impossible to control.

The German sports manufacturers launched the 'Jabulani' ball in December and it will be used throughout the upcoming tournament in South Africa. In the last few weeks it has been blasted due to its perceived unpredictable movement and was labeled a "beach ball" by Real Madrid and Spain shot-stopper Casillas after the weekend 3-2 victory against Saudi Arabia.

Speaking to reporters today, company spokesman Thomas van Schaik brushed aside the accusations. He insisted the ball has been tested thoroughly since its launch, praised by most professionals who have used it and declared all balls move erratically at altitude where several matches will be played in the competition.

Van Schaik had previously praised the creation of the ball, proclaiming it as "small and heavy, allowing for maximum accuracy, perfect grip and exceptionally stable flight."

Adidas sponsored players Kaka, Michael Ballack and Frank Lampard have also defended the ball's playability.

The 2010 World Cup is fast approaching, so keep up to date with all the news at Goal.com's World Cup homepage and join Goal.com USA's Facebook fan page!

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