Model [ NK11394451]Nike Free RN 2017 Running Shoes Deep Royal Blue/Soar/Ghost Green/WhiteLightweight, Low-Profile Flexibility.The Nike Free RN 2017 Men's Running Shoe weighs less than previous versions and features an updated knit material for an even more comfortable fit and flexible feel. Lightweight BreathabilitySingle-layer knit material is soft and breathable to help you stay cool from your first mile to your last. Adaptive FitDynamic Fit technology wraps your foot for a secure, locked-down feel. Flywire technology - strong, lightweight cables - integrate with your laces for additional arch support. Flexible ComfortThe lightweight, low-profile Nike Free sole flexes with your foot for a comfortable, natural ride. More DetailsMinimal tongue design enhances breathability on top of the foot. Insole conforms to the shape of your foot for complete comfort. Rounded heel lets you move naturally. Targeted rubber at the toe and heel for traction. Weight: 8.4 ounces (men's size 10). Offset: 8mm Nike Free OriginsAfter learning that Stanford athletes had been training barefoot, three of Nike's most innovative and creative employees set out to develop a shoe that felt natural and weightless, similar to bare feet. The team spent four years studying the biomechanics of runners' feet in motion. 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.