ALL-WEATHER COMFORT. DYNAMIC FLEXIBILITY.The Nike Free RN Distance Shield Women's Running Shoe features Lunarlon cushioning for comfort during longer runs, along with updated water-repellent fabric and durable traction to take you through challenging weather conditions.All-Weather ProtectionA durable, water-repellent coating with targeted breathability helps you stay dry and comfortable. Durable rubber at the toe and heel adds traction over wet surfaces.Move NaturallyThe 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 CushioningThe 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.More DetailsFlywire technology wraps your midfoot for an adaptive fitPartial inner sleeve wraps your forefoot in breathable comfortDeconstructed mesh heel provides support and breathabilityReflective laces and additional details enhance visibility in low lightAnatomical heel enables more natural motionWeight: 207 grams approx. (women's size 5.5)Offset: 4mmNike 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. 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.