Different companies guess about US to Euro size conversions differently. Euro sizes never convert to a US size directly. The Euro system is different. Akin to metric, don't use a 9/16ths wrench when it is a 15mm nut. If that is too hard of a concept to handle take up running and leave us alone. Usually a 44 shoe fits me perfectly, but I vary from a 9.5 to a 10 in US sizes.