The AlumiBite(TM) Star Wading Boot Cleats (10 Count) from Simms are specifically engineered to fit with our VibramA(R) rubber outsoles utilizing corrosion-free aluminum to conform to micro-surfaces of rocks. Designed to fit predefined cleat locations on VibramA(R) rubber outsoles featured on Simms RiverTreadA(R), StreamTread(TM) & VaporTread Platforms Corrosion-free aluminum is softer than carbide & conforms to the micro surfaces of rocks producing excellent grip