Please choose size according to the foot length (from heel to toe ) ! Different country different material have different size standard . So our US size ,Europe size may have some different with yours. Pls measure foot length at first and then choose size correspondingly. 22.1-22.5cmfoot length =5 size , 22.6-23cmfoot length =5.5 size , 23.1-23.5cm foot length =6 size , 23.6-24cmfoot length =6.5 size , 24.1-24.5cm foot length =7 size , 24.6-25cmfoot length =7.5 size , 25.1-25.5cm foot length =8 size , If your foot size is standard ,please choose size as above. If your foot size is fatter than standard , please choose the bigger one size . If your foot size is thinner than standard , please choose the smaller one size .