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 to "Keep 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.Individual toe slots enhance dexterity, control and stability to deliver a natural walking motionThin, abrasion-resistant polyamide stretch fabric fits low on feet and offers quick-drying comfort; breathable stretch-mesh panels keep debris and grit outInstep straps secure with rip-and-stick closures and are attached to thin webbing straps that wrap around heels to provide a secure, supportive fitFootbeds feature AEGIS Microbe Shield® antibacterial treatment to help control odors2mm EVA midsoles help provide light cushioning underfootVibram soles are designed to follow the contours of your feet and toes; made of nonmarking Vibram TC1 performance rubberRazor siping on soles provides sure grip on wet and slippery surfacesMay help you feel an increased sense of balance, expanded range of motion and improved postureIn order to allow your feet to adapt to using different muscles, gradually increase usage of these shoesMachine washable in cold water; air dry only