Just a simple step to follow if you don't already know your wrist size.
We advice to use a tape measure but if you do not have one, take any smallpiece of ribbon or cord. Wrap it around your wrist and measure the length against a ruler.
For a better comfort, we advice to add 1cm / 0.4inc
Don't hesitate to ask for custom size, we' ll be happy to help you without any additional cost.