Alton Orin Swim Fins Details: Soft Flex, universal fins Made from Malaysian rubber. Fins Float Ergonomic foot pocket for optimum comfort Blade stiffener for enhanced propulsion Exclusive blade design for maximum control Vacuum drain design eliminates water and sand Size Chart: Men's Sizing Extra Small: 3.5-4.5 Small: 5-6.5 Medium Small: 7-8 Medium: 9-10 Medium Large: 10-11 Large: 11-12 X-Large: 12-13