NATURAL FLEXIBILITY. DURABLE COMFORT.The Nike Free RN CMTR Men's Running Shoe is inspired by those who fit their runs into their busy lives. A low-profile look and lasting comfort means you can wear this shoe on any run or all day long.Dynamic MovementThe midsole expands multi-directionally to deliver more dynamic flexibility with every step.Pliable SupportDurable mesh stretches across your midfoot and heel for support with breathability.Comfortable CushioningSoft foam allows pressure to distribute evenly across your foot, delivering exceptionally comfortable cushioning.More DetailsFlywire cables for lightweight support and an adaptive fitSolid rubber segments under toe and heel enhance durabilityReflective elements enhance visibility in low lightWeight: 237 grams approx. (men's size 9)Offset: 8mmNike 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.