American feet are getting bigger! The best-selling shoe size for men is 10.5 and for women it is 8.5. That is a full size larger than 30 years ago, according to the National Shoe Retailer's Association. And if you think you know your correct foot size, you may be off – a report in the Journal of Foot and Ankle Surgery suggests roughly 85% of people underestimate their size by at least half a size. At HAIX® we strive to help you find the best fit with our built-in arch support which realigns the foot and ankle to a neutral position, helping to restore natural foot function.