Story An elite runner engineered for maximum energy return Nike continues its legacy of performance with the Pegasus 42, a runner built to handle the daily grind with elite-level responsiveness. By integrating a full-length Air Zoom unit with a high-rebound ReactX foam midsole, these shoes turn every pavement strike into forward momentum. Whether you’re grinding out a long-distance base or hitting a quick tempo set, the updated mesh upper and spacious forefoot ensure your comfort never falters. Features Full-length Air Zoom unit sculpted for a propulsive feel and maximum energy return from heel to toe ReactX foam midsole provides 13% more responsiveness than previous React tech for a livelier ride Waffle outsole features high-abrasion rubber and flex grooves for superior traction and durability Updated MR-10 2.0 last offers a wider toe box and forefoot for a more natural, comfortable fit Soft mesh upper delivers lightweight breathability to keep feet cool during high-intensity efforts Sizing The Pegasus 42 fits true to size. Take your usual shoe size. Materials Upper: Lightweight engineered mesh Midsole: ReactX foam Cushioning: Full-length Air Zoom unit Outsole: High-abrasion rubber