The Nike Mag, aka Back to the Future sneakers, have been a work in progress since 2011. However, it wasn't until 2015 that they featured the self-lacing technology which made them a pop culture hit. Now, after a brief tease by Michael J. Fox last year, Nike today announced its plans for a general (albeit very limited) release of its second-gen Mags, this time with the "Adaptive Fit" laces that tighten themselves. Here's how it works: Nike has opened an online raffle for people to have a chance at winning a pair, where they can buy an unlimited amount of tickets for $10 each.