Designed to offer the most natural running experience, the Nike Free 3.0 Flyknit Women's Running Shoe helps you run the way you were meant to with an ultra-low-profile midsole and a lightweight, supportive Flyknit upper. Enhanced Movement Hexagonal flex grooves offer six points of flexibility to let your foot move naturally in every direction. Secondary cuts in the midsole enhance natural range of motion. Natural stride With a 4mm offset between heel and forefoot height, the Nike Free 3.0 Flyknit features the lowest-profile midsole and a rounded heel to encourage a more natural footstrike. Support Now with a slightly looser weave, the strong, lightweight Flyknit upper provides snug, supportive comfort that promotes natural motion. Flywire integrated with the laces delivers added support and an adaptive fit. More Benefits Moulded sockliner mimics your foot's shape for added support Solid rubber under the toe enhances traction and durability Waffle grip pattern on the outsole absorbs impact and adds responsiveness Product Details Weight: 6.3 ounces (women's size 8) Midsole offset: 4mm 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 running shoe from the inside out.