Nike Zapatos Hombre FLEXIBLE SUPPORTThe Nike Free Ace Leather Men's Shoe combines a leather upper with deep flex grooves in the outsole for premium support and a natural ride.BenefitsLeather upper with molded elements and perforations lend a supportive fit and ventilationMidfoot strap provides a secure fitFull bootie design wraps your foot for premium comfortPhylon midsole for lightweight cushioningDeep flex grooves allow your foot to move more naturallyRubber pods in the outsole enhance tractionNike 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 pressure-measuring 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.