More cushioned than the 3.0 and closer to the ground than the 5.0, the Nike Free 4.0 Flyknit Men's Running Shoe is designed to unleash your natural stride with a low-profile midsole and a lightweight, supportive Flyknit upper.
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.
With a 6mm offset between heel and forefoot height, the Nike Free 4.0 Flyknit features a very low-profile midsole and a rounded heel to encourage a more natural footstrike.
The strong, lightweight Flyknit upper provides a contoured, supportive fit with stretchy polyester yarn. Flywire integrated with the laces delivers added support and an adaptive fit.
Asymmetrical lacing reduces lace pressure
Non-stretch heel material for structure and support
Molded sockliner mimics your foot's shape for added support
Solid rubber under the toe enhances traction and durability
Waffle outsole pistons absorb impact and add responsiveness
Weight: 7.55 ounces (men's size 10)
Midsole offset: 6mm
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.
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.