Jimmy Choo shoes are constructed on a European shoe last and developed using a European size system. Unfortunately there is no universal standard size conversion chart, so converting European to US sizes is an inexact science. We strive to fit-test every Jimmy Choo shoe, and we continually analyze customer feedback on fit. Taken together, this information helps us to provide the fit recommendations you see posted above. Just as the EU to US translations can vary from brand to brand, so does every individual’s foot shape and fit preferences, so we understand that our fit recommendations may not work for every customer.