The versatile Nike Air Zoom Pegasus 41 delivers consistent comfort, an ideal all-round running shoe for your daily run. Take on your running challenge with the Air Zoom Pegasus 41. Midsole The midsole is made of ReactX foam. Compared to Nike React foam, ReactX is designed to reduce the carbon footprint of a pair of midsoles by at least 43% due to the reduced energy used in the manufacturing process, and to increase energy return by 13%. Built into the midsole of this shoe is a Zoom Air Unit, which absorbs impact and then quickly rebounds, reducing stress on muscles, joints and tendons. Zoom Air Units allow you to run faster and jump higher because they transfer energy more efficiently. Upper Air Zoom Pegasus 41's mesh upper keeps the shoe breathable and comfortable while running. 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. This contains honeycomb studs that provide grip on both dry and wet surfaces.