Icetrax Pro are ice grippers designed for use by individuals with walking or balance disabilities. These treads provide sure footing on slippery steps, snow-covered sidewalks, and icy parking lots. Made of tear-resistant rubber, they are equipped with stainless steel coils rather than cleats. The SkidLock coil system presses downward with each step, becoming embedded in the ice below. As the user transfers weight onto the foot, hundreds of SkidLock surfaces squeeze into the ice providing stability in all directions. SIZES: Small (fits men's shoe sizes 5 to 8.5 or women's shoe sizes 6.5 to 10), medium (fits men's shoe sizes 9 to 11 or women's shoe sizes 10.5 to 12.5), or large (fits men's shoe sizes 11.5 and up and women's shoes size 13 and up).