At home in the water or in chillier conditions, the men"s Vibram FiveFingers Flow multisport shoes offer the freedom of bare feet with the grip and protection of a Vibram sole.2mm neoprene uppers provide light insulation and protection and help keep stuff out; instep and heel straps secure with rip-and-stick closures to provide a secure fitIndividual toe slots enhance dexterity, control and stability to deliver a natural walking motionAEGIS Microbe Shield® antibacterial treatment helps 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 surfacesRecommended for cold weather running, trekking, bouldering, water sports and canyoneeringIn order to allow your feet to adapt to using different muscles, gradually increase usage of these shoesMachine washable in cold water; air dry onlyTo determine size, stand with heels against a wall and measure from the wall to the tip of the longest toe on each foot; use the longer of the 2 lengths with the size chart