Plsase read the following first:
NO.1 The size you see is not a standard European or American size, so you need to accurately measure the length of your feet. Then according to your actual length, choose the size according to our size chart.
NO.2 The length of the insole should be 0-1.5cm larger than the length of the foot
As shown in the picture below, measure your foot length accurately.
US Size 6 = China Size 38 Fit For Bare Foot Length 24 cm
US Size 6.5 = China Size 39 Fit For Bare Foot Length 24.5 cm
US Size 7 = China Size 40 Fit For Bare Foot Length 25cm
US Size 8 = China Size 41 Fit For Bare Foot Length 25.5 cm
US Size 8.5 = China Size 42 Fit For Bare Foot Length 26 cm
US Size 9.5 = China Size 43 Fit For Bare Foot Length 26.5 cm
US Size 10 = China Size 44 Fit For Bare Foot Length 27 cm