THE TRAINERS1 from Back To The Future II! GREAT SCOTT!
That's Back To The Future II with an exclamation mark after it, not Back To The Future III.
These are being sold1 for Michael J Fox' charity, super limited edition, by auction, going to be thousands of dollars per pair. The first pair went for $32,000 apparently.
I think it was 2015 in the film that Marty had a pair, so I guess they ought to be available about now.
Paul Clarke's blog - I live in Hythe in the deep South. Married + father to 2, I am a full-stack web engineer, and I do javascript / nodejs, some ruby, python, php ect ect. I like pubbing, running, eating, home automation and other diy jiggery-pokery, history, genealogy, Television, squirrels, pirates, lego, + TIME TRAVEL.