Nike Free Run 2 NSW iD Shoe

The Nike Free Run 2 NSW iD features tightly woven mesh for ventilation and better protection from cold, wind, rain and debris that could get caught in your shoes on fall and winter runs. Suede overlays wrap the foot for a snug, comfortable fit.

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, just like 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.

• Deep Nike Free flex grooves along the outsole for natural range of motion and flexibility
• Fused Phylite midsole and outsole for an ultra-lightweight, resilient ride