The Air Jordan 4 was first released in 1989 and was designed by Tinker Hatfield. It was the first Air Jordan model to feature a visible air unit on the heel, as well as padded side panels for extra support. The AJ4 also featured a black midsole and a full-length rubber outsole. Over the years, the AJ4 has been released in countless colorways and variations, making it one of the most popular Air Jordan models ever made.