SUPPORTIVE, SOCK-LIKE COMFORTThe Nike Free Transform Flyknit Women's Training Shoe delivers the flexible support your workout demands with a woven, sock-like upper and an innovative outsole that expands, flexes and contracts with your foot.Flexible, Stable FoundationThe tri-star outsole pattern expands and contracts in every direction, with your every step, to disperse pressure evenly and enhance flexibility and stability. Rubber pods wrap up the side of the shoe for even more stability and traction.Supportive, Sock-Like FitThe virtually seamless, woven Flyknit upper provides an incredible sock-like fit with targeted areas of breathability, stretch and support.Dynamic LockdownSuper-strong, ultralight Flywire cables hug your foot for dynamic support, loosening and tightening with your foot's natural motion.More Details Injected unit sole (IU) material for light, flexible cushioningOutrigger offers stability during side-to-side movementsOutsole flex grooves enhance flexibilityFlyknit Origins Nike Flyknit technology was inspired by feedback from runners craving 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.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. 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.