MOVE NATURALLY The 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. Benefits: • Combination textile and technical skin upper for lightweight comfort and support • Flex grooves for more natural movement and extraordinary feel • Injected Phylon midsole for lightweight cushioning • Rubber pods in outsole enhance durability in high-wear areas Nike 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.