In 2015 Marty McFly donned self-lacing Nikes. And they were fly. It took 22 years, but today Nike released real versions of the coveted kicks showcased in Back to the Future. Earlier, director Frank Marshall hinted at some sort of big announcement on Twitter, "Something big is coming soon. Can't say anything yet. No one should know too much about their own destiny. #BTTF" Today it happened. Nike announced the Nike Air Mag, a pretty close replica of the futuristic footwear. We have finally caught up to the imagined technological wonderworld of Back to the Future--we've come so far. Well, not really. A look at the 2008 patent Nike obtained for an "Automatic lacing system" reveals some pretty simple mechanisms. Even so nostalgia and general awesomeness of the very close replica still make for a pretty awesome shoe.
Back in 2008 Nike released Hyperdunks, a proto-version of the Marty McFly shoe that didn't include the pressurized auto-lacing mechanism and only kind of looked like Marty's kicks, with the same high-top look. They weren't aesthetically or mechanically ideal. These look more legit.
A look at the patent literature gives a general outline of the thinking and technology behind the footwear. As the diagram shows, a weight sensor triggers a motor, which causes the shoes to tighten and close. For those with claustrophobic feet, the wearer can also manually loosen the apparatus. Nothing too novel.