The Air Jordan 21 (XXI) with Black/Metallic Silver/Varsity Red colorway feature a black suede upper with red accents,but are a low top version of the Air Jordan 21 . They still feature technical specifications such as breathable textile uppers, a double-overlasted phylon midsole supporting four I.P.S.(Independent Podular Suspension) pods on the outsole. There is a carbon fibre shank plate in the midsole, as well as an improved I.P.S. technology with interchangeable heel Zoom air pillars or encapsulated air pillars. The Air Jordan 21 shoes was released on November 2, 2006.