SIZING INFO: There are 4 sizes to ensure a great fit. SMALL: women size 8 and below. MEDIUM: women 8.5 to 10.5 and men 7 to 10. LARGE: women 11 and above and men 10.5 to 13. X-LARGE: men 13.5 and above. The sizing indicated above is approximately 98% accurate, though some shoes are bulkier or more narrow than the average shoe. If you have questions as to what size you should order, please contact us with the length and width measurement of the bottom of your shoe. Ordering a shoe cover that is far too large can become a trip hazard and we want you to be safe in Pro Shoe Covers. We are happy to assist you in selecting the proper size.