More flexible than the 5.0 and more cushioned than the 3.0, the Nike Free 4.0 Flyknit Women's Running Shoe unleashes your natural stride with a lightweight, supportive Flyknit upper and a highly flexible, low-profile outsole.

ULTRALIGHT SUPPORT

The Flyknit upper―a one-piece layer made entirely of polyester yarn―seamlessly integrates areas of stretch and structure, providing ultralight support and a contoured fit. Knit-in Flywire cables cradle the midfoot for enhanced support where you need it most.

EXCEPTIONAL FLEXIBILITY

New hexagonal flex grooves are hot-knife cut into the outsole and wrap around the sidewall so your foot moves more naturally in every direction. Secondary cuts intersect the flex grooves, adding even more flexibility.

NATURAL STRIDE

The heel mimics the shape of the foot, rolling with the ground to promote a more natural footstrike.

6MM OFFSET

With a 6mm difference between heel and forefoot height, the Nike Free 4.0 Flyknit gets you closer to the ground for a more natural feel while still offering a great blend of cushioning and support.

MORE BENEFITS

·         Attached Nike Flyknit tongue with notches for easy entry

·         Minimal sockliner molds to your foot's curvature for added support and comfort

·         Non-stretch, knit-in heel for structure and support

·         Asymmetrical lacing for reduced lace pressure on the top of your foot

·         Waffle outsole lugs help absorb impact and add responsiveness

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. Since Nike Free's introduction, millions of runners have trained in the shoe, including some of Kenya's world-class runners.