The launch of the original Saucony Freedom ISO marked a major innovation in running shoe technology by being the first to feature a full-length EVERUN midsole, delivering enhanced energy return, superior durability, and a more responsive, cushioned ride. Designed as a premier neutral trainer, it combined this new foam technology with a flexible ISOFIT upper to create a highly versatile, "barely-there" feel that could handle both daily training and speedwork.