Size Chart:
S:4.5-5.5 M US Women /3-4 M US Men = Insole Length 8.5in = EU 36-37
M:6.5-7.5 M US Women / 5-6 M US Men = Insole Length 9.0in = EU 38-39
L:8.5-9.5 M US Women / 7-7.5 M US Men = Insole Length 9.5in = EU 40-41
XL:10.5-11 M US Women / 8-9 M US Men = Insole Length 10in = EU 42-43
XXL:12-13 M US Women / 10-11 M US Men = Insole Length 10.5in = EU 44-45
Please allow 2-3% size difference according to manual measurement.