The Vibram FiveFingers KSO for Women in Black/Black is an alternative to traditional footwear for running and fitness training. It features a thin, abrasion-resistant stretch polyamide and breathable mesh upper that wraps your entire forefoot to 'Keep Stuff Out.' A single hook-and-loop closure helps secure the fit while the non-marking 3.5mm Vibram TC1 performance rubber outsole is razor-siped for enhanced flexibility and a sure grip on wet or dry surfaces.