Unleash your best self every day with the Nike Air Zoom Pegasus 41 Premium, the ultimate choice for comfort on every run. Take on your running challenge with the Air Zoom Pegasus 41 Premium. 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 The mesh upper makes the Air Zoom Pegasus 41 Premium very breathable and ensures a comfortable feeling while running. Outsole The shoe's rubber outsole provides good grip and traction while running. The forefoot has extra flexibility due to the flex grooves in the outsole and this ensures a smooth way of walking. This shoe has Nike's characteristic waffle pattern as an outsole, with short rubber studs in the shape of honeycombs, for grip on wet and dry surfaces.