Fans of the previous edition of this running shoe will love the updates in the Saucony Triumph ISO 4. A new EVERUN midsole, now full length, cushions throughout the run. An engineered mesh upper contributes to a lightweight fit, and an updated ISOFIT design creates a dynamic fit system by adapting to the shape and motion of the runner’s foot. In the midsole, this full-length EVERUN was designed to enhance energy return and continuous cushioning. And EVERUN Topsole construction was built to enhance energy return. On the outsole, TRI-FLEX flex-groove design enabled greater ground contact and flexibility.