If foot length is 24cm.    Choose size 38 =6.5
If foot length is 24.5cm. Choose size 39 =7
If foot length is 25cm.    Choose size 40 =7.5
If foot length is 25.5cm. Choose size 41 =8
If foot length is 26cm.    Choose size 42 =9
If foot length is 26.5cm. Choose size 43 =9.5
If foot length is 27cm.    Choose size 44 =10
If foot length is 27.5cm. Choose size 45 =10.5
If foot length is 28cm.    Choose size 46 =11