The Nike Free 5.0 Print Dark Fireberry/Volt/Black of Women's Nike Running Shoe combines a highly flexible, low-profile outsole for natural movement and the cushioning, traction and lightweight support of a traditional running shoe.EVERYDAY NATURAL FLEXIBILITYEveryday FlexibilityNew hexagonal flex grooves are hot-knife cut into the outsole and wrap around the sidewall, allowing your foot to move more naturally in every direction.Support and BreathabilityThe lightweight knit mesh upper is reinforced with Flywire on the midfoot for lightweight ventilation and an adaptive, supportive fit that moves with you.Natural StrideThe heel mimics the shape of your foot, rolling with the ground to promote a more natural footstrike.8mm OffsetWith an 8mm difference between heel and forefoot height, the Nike Free 5.0 offers the highest offset of Nike Free running shoes for greater cushioning with the foot-strengthening benefits of natural motion.More Benefits No-sew overlays for support and durability without added weight Traditional tongue construction to cushion lace pressure Minimal sockliner molds to your foot's curvature for added support and comfort Waffle outsole lugs help absorb impact and add responsiveness Weight: 7.3 ounces (women's size 8)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. Since Nike Free's introduction, millions of runners have trained in the shoe, including some of Kenya's world-class runners....The Nike Shoes more colors