Size 6.5=38--fit for foot length is 24.5cm. Size 7=39----fit for foot length is 25cm. Size 7.5=40--fit for foot length is 25.5cm. Size 8=41----fit for foot length is 26cm. Size 8.5=42--fit for foot length is 26.5cm. Size 9.5=43--fit for foot length is 27cm. Size 10=44---fit for foot length is 27.5cm.