SIZING: Please measure the bottom of your cast from the tip of your toes to the back of the cast. Small = 9" to 10.25” - Medium = 10.5 to 11.25” - Large = 11.5" to 12.5” - X-Large = 12.75" to 13.75". Do not round up or the boot cover will be too large. Please contact our office if you'd like assistance. Protect your cast, brace, orthosis or bandages and keep your foot covered and dry. Made with weather-resistant fabric and has full sole coverage. Our non-slip sole has been ASTM safety tested in a laboratory for its non-skid abilities and provides excellent grip for safety. Size chart displayed in pictures.