"Power laces — all right!" In "Back to the Future Part II," teenage time traveler Marty McFly (Michael J. Fox) was understandably impressed by a pair of sneakers that conformed to his feet and laced themselves automatically.
It only took 27 years, but Nike has produced those science-fiction kicks and is putting them up for grabs. But there's a catch: Only 89 pairs are available. ['Star Wars' Tech: 8 Sci-Fi Inventions and Their Real-Life Counterparts]
The limited-edition release of the 2016 Nike Mag offers the self-lacing sneakers through an online lottery in collaboration with the . . .