If you are lost in translation, this guide should help. 

WOMEN SIZES

USA
MEXICO
 CENTIMETERS
5 22 22
5.5 22.5 22.5
6 23 23
6.5 23.5 23.5
7 24 24
7.5 24.5 24.5
8 25 25
8.5 25.5 25.5
9 26 26

 

MEN SIZES

USA
MEXICO
CENTIMETERS
7 25.5 25.5
7.5 26 26
8 26.5 26.5
8.5 27 27
9 27.5 27.5
9.5 28 28
10 28.5 28.5
10.5 29 29
11 29.5 29.5
12 30 30

SIZING GUIDE