A true legend among specialized trail running footwear, the Saucony Peregrine ISO is back with updated features to make this year's edition the best we've seen. EVERUN™ in the topsole and a PWRFOAM midsole continue to provide an energy-packed run on trails while the rugged PWRTRAC outsole gives runners the durability and traction needed on rugged terrain. What's New?:This award-winning trail running shoe now features an ISOFIT upper construction that provides runners with a more adaptive fit around the foot. Technical Elements Upper: ISOFIT dynamic upper construction provides a more adaptive and comfortable fit around the foot. Flat laces reduce irritation. Heel Reflective offers increased visibility and safety. Midsole: EVERUN™ Topsole construction provides a lively, resilient ride while offering continuous cushioning and enhanced energy return properties. PWRFOAM midsole promotes a smooth ride and added rebound. Outsole: PWRTRAC outsole is engineered to adapt to various terrain types for excellent traction and durability.