legendary look and maximum comfort. the nike air max st btv infant/toddler shoe features the iconic air max design and a combination upper for durability and classic style. responsive midsole cushioning delivers superior impact protection.. benefits. combination leather and textile upper with overlays for comfort and durability. full-length polyurethane midsole for lightweight cushioning. visible air-sole unit for cushioning and maximum impact protection. rubber outsole for traction and durability. nike air max origins. nike's revolutionary air-sole unit made its way into nike footwear in the late '70s. in 1987, the nike air max 1 debuted with visible air in its heel, allowing fans more than just the feel of air-sole comfort—suddenly they could see it. since then, next-generation nike air max shoes have become a hit with athletes and collectors by offering striking colour combinations and reliable, lightweight cushioning..