The Nike air max 90 is the third generation of Nike Air Max.It did not well know by public until a couple years after the release.The free running shoes is a good running shoe.Polyurethane midsole with visible Max Air cushioning in the heel;leather/mesh upper for light-weight and breath.The Nike Air Max 90 is one of classic Nike shoes.The 2010 is the 20 years anniversary of Nike Air Max 90,it will be hot collecting this year.