The Nike Air Trainer Max 91 was originally created in the 90s as a true cross-trainer, designed to meet the needs of athletes in any discipline. This retro release carries over the same design inspiration, with a leather upper that features the recognizable instep cross straps to secure the foot and provide stability. Other details include an Air® unit in the heel for cushioning and a running-inspired rubber sole thats perfect for working out in a gym or taking it to the streets.