Nike Pegasus 41 Women's Road Running Shoes Responsive cushioning in the Pegasus provides an energized ride for everyday road running. Experience lighter-weight energy return with dual Air Zoom units and a ReactX foam midsole. Plus. improved engineered mesh on the upper decreases weight and increases breathability. Crafted for performance and planet. ReactX foam is engineered to reduce its carbon footprint by at least 43% in a pair of midsoles due to reduced manufacturing process energy compared to prior React foam.