Simms 37821 Alumibite CleatA cleat from Simms that is specifically engineered to fit with our Vibram rubber outsoles utilizing corrosionfree aluminum to conform to microsurfaces of rocksFeaturesCorrosionfree aluminum is softer than carbide & conforms to the micro surfaces of rocks producing excellent gripDesigned to fit predefined cleat locations on Vibram rubber outsoles featured on Simms RiverTread, StreamTread & VaporTread PlatformsMachined & manufactured in Bozeman, Montana