Designed for the athlete looking for the highest level of protection and support available today without excess weight and bulk. Polypropylene shell provides lightweight protection without sacrificing stability and support. Custom-cut and -molded EVA foam pads provide a more comfortable fit and improved durability compared to the foam or neoprene pads found in other rigid braces. Redesigned bilateral hinge provides a smoother motion than previous models. Molded bearing design allows for free and easy movement without the normal amount of plastic resistance. Small - Men"s Shoe Size 5-8.5; Women"s Shoe Size 6.5-9.5; Medium - Men"s shoe size 9-12, women"s shoe size 10-13; Large - Men"s shoe size 12.5-16; Women"s shoe size 13.5-16.