Part of the RUN EVERUN collection, the Saucony Breakthru 4 running shoes feature long-lasting, responsive cushioning youll never want to run without. This new edition includes a redesigned mesh upper that provides improved fit. With a lightweight and flexible feel, these shoes are perfect for tackling a track workout or hitting the gym for a cardio circuit. Upper: Improved, engineered mesh upper provides lightweight support and a dynamic fit. Padded tongue and heel collar enhance comfort. Flat laces reduce irritation. Midsole: EVERUN Topsole construction for enhanced energy return and continuous cushioning throughout the run. Outsole: iBR+™ is 33% lighter and provides more cushioning compared to standard blown rubber. TRI-FLEX outsole for optimal flexibility and increased ground contact.