SUPPORTIVE, NATURAL RIDE The Nike Free 5. 0 EXT Men's Running Shoe features Flywire technology for support and an adaptive fit. Made with a mesh upper and durable, flexible Nike Free midsole/outsole, this lightweight shoe offers breathable comfort and a barefoot-like feel. Benefits Mesh upper for breathability Inner sleeve made with textured mesh for a dynamic, sock-like fit that hugs the foot and allows for easy on and off Flywire technology at the midfoot for a secure, supportive fit Fused Phylite midsole and outsole for an ultra-lightweight, resilient ride Pistons for shock absorption and responsiveness Product Details No-sew and synthetic overlays for lightweight durability and support Diagonal cuts through the arch for flexibility and foot strength 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 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.