The Michael J. Fox Foundation announced on Thursday morning that this year's release of the Nike Mag raised $6.75 million for Parkinson's research. The money was raised through Nike's The Draw release of the shoes and one charity auction each in Hong Kong and London.

Can we use the $6.75M sum to work backwards and find out how many entries there were in the contest to win a pair? Not quite—the $10 tickets to enter purchased on the last day of the drawing were matched dollar for dollar with donations, which messes up the math for anyone trying to calculate the odds on winning a pair. That being said, Tinker Hatfield said this week that "millions" entered.

Nike notified the winners of the Back to the Future shoes via its Nike+ app on Oct. 17.

There's still one more chance to purchase a pair of Nike Mags. The final one from the 89 pair run will be auctioned off on Nov. 12 at "A Funny Thing Happened on the Way to Cure Parkinson's," the Michael J. Fox Foundation's benefit gala in New York City. The pair auctioned in London sold for roughly $56,800 USD, while Hong Kong's went for around $104,000.

The initial charity release of the Nike Mag in 2011 raised $4.7M, with Google's Sergey Brin matching and raising the total to $9.4M.