Nike's famous self-tying sneakers from Back to The Future 2 are now a reality.

Called the 2015 Nike Mag, the sneakers feature power lacer technology, built-in lights and the original design from the 1989 film.

Nike made the announcement in a press release and a personal letter sent to actor Michael J Fox, who played lead Marty McFly in the film series.

In a video showing Fox trying on the shoes, the Back to the Future star declares: "That's cool ... that's insane ... that's really great."

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Michael J. Fox models the first self-lacing Nike Mags.

Michael J. Fox models the first self-lacing Nike MAG.

Posted by The Michael J. Fox Foundation for Parkinson's Research on Wednesday, October 21, 2015

The letter reads: "Almost thirty years ago we embarked on a journey to create a glimpse into 'the future'," the letter read."Although the project started as science fiction, we're now proud to turn that fiction into fact."

Finally! Photo / Twitter / Michael J Fox
Finally! Photo / Twitter / Michael J Fox

The announcement comes as US fans of the film celebrate Back to The Future Day - the exact day Marty McFly and Doc Brown time travelled to in the first sequel.

The self-tying trainers are now a reality. Photo / Nike
The self-tying trainers are now a reality. Photo / Nike

The 2015 Nike Mag limited edition sneakers will only be available to buy via auction, with all proceeds going to the Michael J Fox Foundation for Parkinson's Research.

- AAP