Like with the 2011 versions of the Air Mags, come 2016 the power lace versions will only be available in limited quantities through an auction with all the proceeds going to the Michael J. Fox Foundation for Parkinson’s Research.

So if you thought the original versions were expensive, you’re probably going to have decide between sending your kids to college, or bidding on a pair of the new Air Mags. If they’ve seen Back to the Future II, however, they’ll totally understand why they’re not getting a higher education.