Voted "Most Popular" for its versatility. The KSO remains among our most popular styles for women for its unbeatable comfort and versatility. 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. 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.