The Nike Free TR 4 Women's Training Shoe features a flexible midsole and an all-new lightweight mesh upper engineered to support training-specific multidirectional movements, making it perfect for functional training, cardio, core work and other gym workouts.Enhanced BreathabilityWith the new engineered mesh upper, the Nike Free TR 4 is lighter and more breathable than its predecessor. The mesh is open in key areas for ventilation and closed in other areas for support.Dynamic SupportUltralight Flywire cables around the forefoot give you the support and dynamic stability you need for quick movement, helping you stay focused through your toughest workouts.FlexibilityThe Nike Free 5.0 midsole has full-length, multidirectional flex grooves for enhanced flexibility and natural range of motion.More Benefits*Tongue designed to lie flat and reduce lace pressure*Inner sleeve wraps the heel for added support*Phylite midsole for lightweight cushioning and durability*Outsole herringbone pattern in the forefoot enhances multidirectional traction*Weight: 12 ounces (women's size 7)Nike Free OriginsAfter 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.
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