The Nike Pegasus Premium features a stretchy circle knit upper with a breathable feel, and overlays to support your foot. The magic happens in the midsole, with a layer of race performance ZoomX right under your foot giving a fast, lightweight and responsive feel. Below that a full-length Air Zoom unit offers a bouncy sensation unlike anything you have run in before. Lastly, in the heel, a layer of durable React X helps absorb every bit of pressure, and give soft, cushioned landings. Finaly a modified waffle outsole has high-abrasion rubber, so you get excellent traction that lasts.