Sports brand Nike is raffling limited editions of the self-lacing shoes that feature in sci-fi film Back to the Future II (+ movie).
The Mag high-top trainers tighten automatically once the foot is inserted, just like the pairs worn by Michael J Fox's character Marty McFly in the 1985 movie.
Now Nike is releasing 89 pairs of the shoes to support Fox's charitable foundation, which raises funds and awareness for Parkinson's disease ? which Fox was diagnosed with aged 29.

Each of the shoes incorporates sensors that prompt motors to tighten the elastic laces in reaction to pressure.
The laces can also be adjusted using buttons just inside the tops. Another control turns the lights in the soles on and off, which also indicate how much life is left in the wirelessly rechargeable batteries.
Related story: Shoes with motorised laces are "totally not a gimmick" says Nike's Tinker Hatfield

Nike has been working on the trainers since 2005, but only recently was able to integrate the required tech.
"We had to wait for technology to shrink," Nike vice president of design Tiffany Beers told Dezeen. "Finally in 2012, technology was small enough that we could really start integrating."

The self-lacing technology also features in Nike's Hyperadapt trainers, launched in March 2016, but the team's challenge for this project was to fit the electronics into the iconic silhouette of the Mags.
"Being the Mag, we couldn't alter the exterior of it ?...