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how to choose size :foot length+1.5cm=shoes insole length if foot length is 17cm(6.7 inch) ,foot length+1.5cm= shoes insole length,so 17cm+1.5cm=18.5cm,you need to choose this size which insole length is about 18.5cm,you can choose us size11.5(cn size30) us size eur size insole lengthinches insole length cm about foot length (inches) about foot length (cm) 5 21 5.3 13.5 4.9 12.5 5.5 22 5.5 14 5.1 13 6.5 23 5.7 14.5 5.3 13.5 7.5 24 5.9 15 5.5 14 8 25 6.