Back to the Future, Part II inspired self-lacing Nike Mags will be available as part of a charity auction in 2016

It’s October 21, 2015 and, if you’ve been online at all today, you know that the future has arrived. Today marks the date that Michael J. Fox’s Marty McFly travels to in Robert Zemeckis’ Back to the Future, Part II. In celebration of the day, Nike has officially announced that the film’s self-lacing Nike Mag shoes will become a reality in Spring 2016. There’s a catch, however, as the Nike Mag sneakers will only be available as part of a series of charity auctions with all proceeds going to the Michael J. Fox Foundation for Parkinson’s Research.

Below, you can take a look at the Nike Mag design and read a handwritten letter that Nike designer Tinker Hatfield sent to Fox. You can even watch a video of Fox trying on the very first pair of self-lacing Nike Mag sneakers.

“We started creating something for fiction and we turned it into fact,” says Nike, Inc. President and Chief Executive Officer Mark Parker. “By imagining the future, we create it. Product that comes alive, with on-demand comfort and support when you need, product that senses you and adapts to you is right around the corner.”

Nike previously released a non-self-lacing version of the shoes back in 2011. 1500 pairs of Nike Mag sneakers raised $5.6 million for the Michael J. Fox Foundation. Unfortunately for most fans, that math averages out to roughly $3,700 a pair. There’s no word yet on whether or not Nike plans to increase availability on the self-lacing versions, but check back for updates as they become available.

These new Nike Mag sneakers follow other Back to the Future promotions such as Pepsi‘s release of Pepsi Perfect replica bottles. The bottles caused their own mini debacle this morning when 6,500 bottles sold out before they were even supposed to have gone on sale. Thankfully for Back to the Future fans, Pepsi has since promised to make more bottles available with a second limited run. Look for those to go on sale at 9:00am EST Thursday, November 3 at Shop.Pepsi.com.