Eminem and Nike have teamed up to create a limited-edition run of the sports-and-fitness company's Air Max shoe series that will be auctioned off for charity beginning Aug. 31.

The rapper (real name Marshall Mathers) is designing limited-edition uppers for eight different shoes in the Air Max series, from the Air Max '87 to the most recent Air Max 360. His reinterpretation of the upper has been laid onto the original blueprints for each of the shoes to create a unique set of designs.

"If you told me 10 years ago that I'd be designing this whole series of Air Maxs, I never would have believed it," Eminem said in a press release. "It's one of the hottest lines that Nike ever produced, so I'm honored to make my own contribution. My only problem was figuring out how to make the shoes different from stuff they've already done. Nike always has the dopest color combos."

Sixty-four pairs of shoes in eight styles will be auctioned off during four weeks via eBay and Nike stores to raise money for the Marshall Mathers Foundation and ninemillion.org. All proceeds will be shared equally between the two charities. All the shoes will be numbered and autographed by Eminem.

Ninemillion.org is a global campaign led by the UN Refugee Agency (UNHCR) with founding partners Nike and Microsoft to raise awareness and funds to bring education and sport programs to the world's refugee youth. According to a press release, the campaign represents the estimated nine million forgotten refugee youth across the globe, many of whom do not have the opportunity to learn and play.

The Marshall Mathers Foundation is a non-profit corporation set up to provide funds for organizations working with troubled youth in southeast Michigan.