ULTIMATE FLEX. CITY TRIBUTE.The Nike Free SB Men's Skateboarding Shoe features groundbreaking flexibility and comfort for the ultimate in board control, and graphics that honor the City of Roses.BenefitsFlex grooves for excellent flexibility and multidirectional movementAllover camouflage graphics pay tribute to Portland, OregonSuede and synthetic leather upper with mesh panels for durability and ventilationRubber toe, side wall and bumper enhance durability and boardfeelPhylon foam at your heel for lightweight cushioningRubber outsole with herringbone pattern for durability and multidirectional tractionNike 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.