MOVE NATURALLYThe Nike Free Hypervenom 2 Men's Shoe is made with flex grooves to help your foot move naturally. Its lightweight combination upper gives you incredible comfort and durable support.BenefitsCombination textile and technical skin upper for lightweight comfort and supportFlex grooves for more natural movement and extraordinary feelInjected Phylon midsole for lightweight cushioningRubber pods in outsole enhance durability in high-wear areasNike Free Origins After learning that Stanford athletes had been training barefoot on the university’s golf course, three of Nike’s most innovative and creative employees set out to develop a shoe that felt natural and weightless, similar to bare feet. In 2002, they examined a group of men and women with pressuremeasuring insoles taped to their feet, using high-speed cameras to capture images of each foot in motion. The team spent eight years studying the biomechanics of shoeless running. The results yielded a profound understanding of the foot’s natural landing angle, pressure and toe position, allowing Nike designers to build an unconventional and flexible running shoe from the inside out.