I wear a 7.5 in most shoes. Clarks 7.5, Birkenstocks 38, etc. In this brand, size up. I bought a 38 and needed a 40. Although customer service was kind, it cost $45 to ship back the $99 shoes. So I kept the shoes and ate the cost. I can’t wear them. I gave them away to someone with smaller feet. The size 38 fits an American size 6.5. Beautiful shoe… order at least a size larger.