In 2006 at the Germany World Cup, a new soccer ball was introduced, which sparked the anger of many goalkeepers, including veteran Oliver Kahn.
The soccer ball, as Kahn and many other goalies would notice, is "built in favor of the striker" meaning that it has several characteristics that make shots stay on the ground and thus, having more chances to hit the goal.
For the world cup 2006, new soccer ball has a new design to it. It was made with different shapes to form a pertecly round ball, which was said to be the most accurate ball. There is a new ball with a new design for world cup 2010. It said to improve more with additional small surface texture to give grip when wheat.