The Nike Air Zoom Span Running Shoe features a woven midfoot saddle that locks you down over the dual-density of Cushlon foam and Zoom Air unit for a fast, snappy ride. Features Zoom Air unit in the forefoot delivers responsive, low-profile cushioning. Decoupled crash pad lets you move naturally. Dual-density midsole for stability that slows the rate of pronation. Engineered mesh forefoot provides zonal support and breathability where you need it most. Dynamic Support technology uses wedged foam to optimize the transition.