Nike announced earlier this week that it will be releasing a new edition of the Nike Mags, its self-lacing shoes inspired by Back to the Future.

There are only 89 pairs, which will be raffled off with proceeds benefiting the Michael J. Park Foundation‘s research on Parkinson’s disease.

TechCrunch got a chance to (briefly) try on a pair of Mags and discuss the technology with Nike Senior Innovator Tiffany Beers.