The Women's Nike Pegasus Premium Running Shoes are engineered to deliver peak responsiveness and high energy return mile after mile. This premium edition introduces a brand new cushioning system centered around a sculpted, full-length Air Zoom unit that is strategically designed to use the power of Air from your initial heel strike all the way through to toe-off. This highly responsive Air unit is paired with a dual-foam midsole featuring ultra-springy ZoomX foam and new ReactX foam in the heel. The circular knit upper keeps your feet cool as the miles add up, while the durable, modified Waffle outsole provides reliable, durable traction with less rubber for a lighter overall shoe.