Below is to teach you how to choose correct shoe size :
Size number here is totally different from shoe size chart in your country, but your bare foot length would never change , so you must measure your bare foot with a ruler , then choose size with chart below .
Unit: mm - millimeter
Bare foot length 236-240, China shoe size 38, Choose 6
Bare foot length 241-245, China shoe size 39, Choose 6.5
Bare foot length 246-250, China shoe size 40, Choose 7
Bare foot length 251-255, China shoe size 41, Choose 8
Bare foot length 256-260, China shoe size 42, Choose 8.5
Bare foot length 261-265, China shoe size 43, Choose 9.5
Bare foot length 266-270, China shoe size 44, Choose 10
Bare foot length 271-275, China shoe size 45, Choose 11
Bare foot length 276-280, China shoe size 46, Choose 12
Bare foot length 281-285, China shoe size 47, Choose 12.5
Bare foot length 286-290, China shoe size 48, Choose 13

The size is measured by hands, it may has 1-5 mm different.

We send CN size,please refer to your foot lenth to chose US size,For exsample, if my foot length is 265mm, I will chose the US size 9.5 = CN size 43.

Insole length is usually 0-15 mm longer than foot length for normal shoes