INCREDIBLY FLEXIBLE. NATURAL FIT.The Nike Free RN Flyknit Women's Running Shoe brings you miles of natural comfort with an exceptionally flexible outsole for the ultimate natural ride. The tried and true Flyknit and Flywire upper provides a sock-like fit with dynamic support.BenefitsNear-seamless Flyknit upper provides an incredible fit and supportMidsole expands multi-directionally for more dynamic movementSoft foam delivers exceptionally comfortable cushioningAsymmetrical lacing reduces pressureFlywire cables integrate with the laces for dynamic lockdownTargeted solid rubber for enhanced durabilityNike 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. The team spent eight 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.Flyknit Origins Nike Flyknit technology was inspired by feedback from runners seeking a shoe with the snug (and virtually unnoticed) fit of a sock. Nike embarked on a four-year mission with teams of programmers, engineers and designers to create the technology needed to make the knit upper with static properties for structure and durability. Then the precise placement of support, flexibility and breathability—all in one layer—was refined. The result is a featherweight, formfitting and virtually seamless upper.