The Nike Shox Navina SI running shoe is for the longtime female runner who is looking for a better ride and fit. Synthetic upper with synthetic overlays provides a flexible upper to enhance fit and feel. New women's specific five-puck Nike Shox� platform adds more cushioning and a better overall ride. Carbon rubber in the heel offers excellent durability and rubber in the forefoot delivers a plush ride. Wt. 10.4 oz.