FREE TO GO FURTHERThe Nike Free RN Distance Men's Running Shoe features Lunarlon cushioning with large hexagonal flex grooves for more natural motion with the soft comfort you need for longer runs.Move Naturally The natural-motion outsole features hexagonal flex grooves that offer six points of flexibility, allowing your feet to move the way they were meant to.Soft Cushioning The lightweight Lunarlon cushioning system delivers miles of soft responsiveness. It fuses soft foam and a lightweight Phylon carrier to deliver an excellent blend of plush comfort and durable support to go the distance.Breathable Comfort Single-layer, engineered knit helps keep your feet cool, while Flywire cables integrated with the laces wrap your arch for an adaptive, supportive fit.More Details Partial inner sleeve wraps your forefoot in breathable comfortDeconstructed mesh heel provides support and breathabilitySolid rubber segments under the toe for enhanced traction and durabilityAnatomical heel enables more natural motionWeight: 249 grams approx. (men's size 9)Offset: 4mmNike 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.