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Due to various manufacturer would provide various standards.Please only refer to the EU size and just choose the US size according to following chart.

There will be possibility of deviation within 0.5-1cm, choosing the size of footwear according to your real situation.

If your feet are wide or narrow,you can choose 0.5 size larger or smaller than standard size. 

US Size-----------EUR Size------------Heel to Toe(cm / Inch）
USA 7.5-----------40-------------------25.0cm/9.8"
USA 8 ------------41--------------------25.5cm/10"
USA 8.5-----------42--------------------26cm/10.2"
USA 9.5 ----------43--------------------27.0cm/10.6"
USA 10 -----------44--------------------27.5cm/10.8"
USA 10.5 --------45--------------------28.0cm/11"