Nike Air Max is a shoe by the company Nike that was introduced in 1987 as the first example of Air Max-branded technologies. The Nike Air Max shoe uses a large air cushioning unit which is visible at the side of the midsole in most models. Especially sought after models include the 1987 (Air Max I), 1990 (Air Max III), 1991 (Air max 180), 1993, 1995, 1997, and to an extent, 2003. The 1993 model was the first to have the fully visible heel Air unit that was visible in the back as well as on the sides, and the 1995 model was the first to feature visible forefoot Air. The 1997 model was the first to include a full length Air bag.