Marty wears a beat-up pair of Nike Bruins:
“No, you and Jennifer turn out fine. It’s your kicks – something’s gotta be done about your kicks!”
Called ‘Alien Stompers’ by Reebok, these were made as hi-tops (Ripley) and low-tops (Bishop) for the film, and mass-produced as low-tops as a tie-in in 1986. They were recently mass-produced in extremely limited numbers in 2016 in both versions to commemorate the 30th anniversary of the film.
Retouched screencaps below the jump: