Our most versitile Vibram FiveFingers. When you're scrambling up a rocky bluff or bounding along a riverbank, the last thing you want is gravel and grit seeping into your Vibram FiveFingers. The KSO is an all-new design with thin, abrasion-resistant stretch polyamide and breathable stretch mesh that wraps your entire forefoot toKeep Stuff Out. A single hook-and-loop closure helps secure the fit. Non-marking Vibram TC1 performance rubber soles are razor-siped for a sure grip. Machine wash at cool tempature and air dry.