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This is Chinese Size,the standard was based on "Foot Length",not "Shoes Length", not "Insole Length".
If you measure Shoes Length, you will order wrong size.
If you measure Insole Length, you will order wrong size.
Size 39 fit for Foot Length 24.5 centimetre.
Size 40 fit for Foot Length 25 centimetre.
Size 41 fit for Foot Length 25.5 centimetre.
Size 42 fit for Foot Length 26 centimetre.
Size 43 fit for Foot Length 26.5 centimetre.
Size 44 fit for Foot Length 27 centimetre.
Size 45 fit for Foot Length 27.5 centimetre.
Size 46 fit for Foot Length 28 centimetre.
Size 47 fit for Foot Length 28.5 centimetre.
Size 48 fit for Foot Length 29 centimetre.
Size 49 fit for Foot Length 29.5 centimetre.
Size 50 fit for Foot Length 30 centimetre.
Size 51 fit for Foot Length 30.5 centimetre.
Size 52 fit for Foot Length 31 centimetre.