LET'S MAKE IT SIMPLE:
If your wrist is ...
6.1" to 6.9" choose MID-SIZE
6.6" to 7.4" choose STANDARD
7.1" to 7.9" choose LONG
*For cm see SIZING GUIDE (BRACELET LENGTH)
LET'S MAKE IT SIMPLE: 6.1" to 6.9" wrist, choose MID-SIZE / 6.6" to 7.4" wrist, choose STANDARD / 7.1" to 7.9" wrist, choose LONG -- (For cm see SIZING GUIDE below)

*Please note: 20 mm version shown above. The 21 mm and 22 mm versions will be slightly different.