Among the most versitile in the 5 Fingers familly, the KSO is one of the most popular styles because of its ubeatable comfort and ability to handle a wide range of conditions. Featuring a thin, abrasion-resistant stretch polyamide and breathable mesh upper that wraps the whole forefoot to avoid catching debris inside. 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.