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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.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 shoeless running. 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. Since Nike Free's introduction, millions of runners have trained in the shoe, including some of Kenya's world-class runners. A lighweight, durable Phylite midsole helps to cushion your foot during impacts. Flywire in the upper integrates with the laces for a supportive, glove-like fit that helps keep your foot stable when you're playing and running. Hexagonal flex grooves in the outsole create six different flex points that allow your foot to move more naturally in every direction. The rounded heel rolls with the ground, encouraging a natural stride. The Nike Free 5.0 Kids' Running Shoe features a super-flexible outsole and a lightweight, adaptive upper for comfort and natural range of motion when you're running and jumping..