Nike is giving away 89 pairs of limited-edition, self-lacing "Back to the Future-"inspired sneakers to winners of a charity raffle.
Contestants can enter the raffle online and can purchase an unlimited number of $10 tickets.
All of the proceeds raised in the raffle will be donated to "Back to the Future" star Michael J. Fox's foundation to help find a cure for Parkinson's disease.
Fox, who was diagnosed with Parkinson's in 1991, debuted the sneakers last year.
The Nike Mag sneakers feature Nike's new HyperAdapt system, which uses a sensor that responds to the weight of a wearer's foot to automatically lace the shoes. The heels of the shoes light up to signal when the shoe is tightening and when the batteries need to be charged.
Related: Nike's futuristic self-lacing sneakers to be released in November
The raffled sneakers will only be available in U.S. men's sizes 7, 9, 11 and 13.
The raffle closes Oct. 11, and winners will be notified on Oct. 17.
Shoes with HyperAdapt technology will be available in the U.S. at select Nike retail locations starting Nov. 28, according to Nike's public relations director, Heidi Burgett.
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