Saucony Men's Zealot ISO 2 Reflex Running Shoe 100% Textile and synthetic Imported Rubber sole Updated with EVERUN topsole construction providing smoother landings in the heel and reduced pressure in the forefoot ISOFIT upper creates a dynamic fit system by adapting to the shape and motion of the runners foot FlexFilm offers a lightweight, flexible fit A newTri-Flex outsole delivers more ground contact and optimal flexibility at toe-off