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From now until December 31st, we’re also donating 10% of each sale to the Michael Phelps Foundation and Natalie’s favorite charity, MOVE. Like H2O Audio, both organizations are committed to helping more people live healthy and active lifestyles.

Enter promo code MPF2010 or MOVE2010 at checkout to choose which charity you would like to support and help make a difference!

Olympic hero Michael Phelps will be out for revenge against Germany’s Paul Biedermann when the pair clash in Berlin in the short-course World Cup meeting on November 14-15, it was announced on Tuesday.

Phelps, 24, who won eight gold medals at the 2008 Beijing Olympics, suffered the first defeat in four years to Biedermann, 23, in the 200m freestyle final at Rome’s World Aquatic Championships last July.

The German also broke Phelps’ world record and the pair are expected to meet again at Berlin’s Landsberger Allee pool.

“He pounded me into the dust in the summer,” said Phelps who will compete in the 200m backstroke, 200m freestyle and the 200m butterfly, as well as the 100m and 200m individual medley relay.

[Via AFP]