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The Nike Free TR 6 Women's Training Shoe delivers the flexibility and stability your workout demands with an innovative outsole pattern that expands, flexes and contracts with your foot during every squat and sprint. MORE DETAILS Breathable mesh lining in the forefoot Molded ankle foam enhances support and fit Foam midsole/outsole for ultralight comfort 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. The team spent eight years studying the biomechanics of runners' feet in motion. 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.