The versatile Nike Air Zoom Pegasus 41 delivers consistent comfort, an ideal all-round running shoe for your daily run. Experience the ultimate performance of the Air Zoom Pegasus 41 every day. Midsole The midsole of this shoe is made of ReactX foam. ReactX is a light, firm foam for a smooth, responsive ride with much less impact. With 13% more energy return and 43% less carbon emissions than regular React foam. Zoom Air Units are incorporated into the midsole. These absorb shock and bounce back quickly. This reduces the strain on your muscles, joints and tendons. You can run faster and jump higher with the Zoom Air Unit because it transfers energy more efficiently. Upper The upper of the Air Zoom Pegasus 41 is made of mesh for good breathability. Outsole The rubber outsole provides the shoe with good grip and traction while running. The forefoot has extra flexibility due to the flex grooves in the outsole, which ensures a smooth gait. The rubber outsole features Nike's iconic waffle pattern. It has short studs in the shape of a honeycomb. This pattern provides grip on both dry and wet surfaces.