The Nike Free 4.0 Print Deep Royal Blue/Blue Lagoon/White/Black of Men's Nike Running Shoe features a seamless mesh upper and deep flex grooves for ventilated comfort and flexibility over any distance.BREATHABILITY AND NATURAL MOTIONBenefits One-piece, seamless mesh with synthetic overlays for breathability and lightweight support Phylite midsole that's tough enough to double as an outsole for cushioning and durability Deep, diamond-shaped flex grooves for flexibility and a natural feel Outsole rubber in high-wear areas for durabilityNike Free OriginsAfter 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....The Nike Shoes more colors