US6.5=EU 35 size , US7=EU36 size ,US7.5=EU37 szie ,US8=EU38 size ,US8.5=EU39 szie ,US9=EU40 size , US9.5=EU41 size ,US10=EU42 size ,US10.5=EU43 size , US11=EU44 size , US11.5=EU45 szie . Please note that : Since the Ioffer description system does not have a suitable size option, the shoe size is calculated according to the Europea siz Shoes sizes 36 to 45