1983, Nike launched AF according to the market situation, and achieved good response. But with the rise of other brands, AF can't keep up. 1985, Nike launched AJ based on AF for the basketball market. In the same year, it launched the DUNK series based on AJ for universities. DUNK is actually a college basketball shoe with exclusive color matching. Skateboarding began to rise in the 1990s, and street trend culture became a part of mainstream culture. So in 1999, DUNK SB series was introduced based on Dunk. This shoe is positioned as a high-end leisure and low-end skateboard. It should be noted that it is a pair of fashionable shoes. This is why AJ appeared first, but DUNK SB got angry first. It was not until many years later that basketball rose in the world that AJ gradually replaced DUNK SB as the protagonist. DUNK SB adopts many new technologies, such as zoom air air cushion, round shoelaces and thick tongue. Of course, the most important thing is its retro trend attribute. DUNK SB is not as expensive as AJ in the street, but people who know shoes dare not say that DUNK SB is not good easily, because the earliest players who played AJ used to be fans of DUNK SB. Although AF also has good shoes, the plot trend of scientific and technological attributes is far less than DUNK SB.