1. This is Chinese Size,the standard was based on "Foot Length",not "Shoes Length", not "Insole Length". In China,only correct "Foot Length" can help you buy correct size. 2. Don't measure Shoes Length,if you measure Shoes Length,you will order wrong size. Don't measure Insole Length,if you measure Insole Length, you will order wrong size. 3. If your foot is wide or fat,you can buy bigger size. 4. Our size chart as follows: Size 35 fit for Foot Length 22.5 cm. Size 36 fit for Foot Length 23 cm. Size 37 fit for Foot Length 23.5 cm. Size 38 fit for Foot Length 24 cm. Size 39 fit for Foot Length 24.5 cm. Size 40 fit for Foot Length 25 cm. Size 41 fit for Foot Length 25.5 cm. Size 42 fit for Foot Length 26 cm. Size 43 fit for Foot Length 26.5 cm. Size 44 fit for Foot Length 27 cm. Size 45 fit for Foot Length 27.5 cm. Size 46 fit for Foot Length 28 cm.