when you order this please measure your wrist circumference. My wrist circumference is 15.5cm and it fits well!
If you are in 15.5~17.5cm then you have to write 'middle' in the size blank.
If your wrist circumference is under 15.5cm then you have to write 'small'
If your wrist circumference is over 17.5cm then you have to write 'big'