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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.Formerly known as the 5.0, recommended for the runner using the free range for the very first time and most like traditional running shoes.Made to fit your foot like a second skin, the Nike Free Run 3 Running Shoes have a breathable mesh upper and a modified inner sleeve for a snug fit that moves with each stride.Unlike the previous v ersion, the upper features large mesh panels on the midfoot that increase airflow for enhanced breathability. The Nike Free 4.0 Running Shoe is more flexible than the Nike Free Run 3 and more supportive than the Nike Free 3.0. MINIMALIST / BAREFOOT RUNNING SHOES The Nike Free 4.0 V3 has a more cushioned barefoot-like feel compare to the other Nike Free family.

A stretchy mesh inner sleeve delivers a sock-like fit that hugs the foot, yet still allows for easy on and off.

Super-Low Profile A low-profile midsole delivers a more barefoot-like feel than the Nike Free 5.0 , with a 6mm offset between heel and forefoot height for a blend of cushioning and flexibility.

Seamless Feel and Highly Breathable The seamless upper provides exceptional comfort and fit with minimal no-sew overlays.

A stretchy mesh inner sleeve with seamless overlays delivers a supportive, skin-like fit and the minimalistic, molded sockliner mimics the foot's curvature for added support and comfort.

Flexibility Flex grooves along the length and width of the outsole enhance flexibility and help maintain stability.