Use a measuring tape on your wrist and look at the chart below
Wrist 14 - 15 cm | Bracelet 16 cm | Measure XS |
Wrist 16 - 17 cm | Bracelet 18 cm | Measure S |
Wrist 17 cm | Bracelet 19 cm | Measure M |
Wrist 18 - 19 cm | Bracelet 20 cm | Measure L |
Wrist 20 cm | Bracelet 21 cm | Measure XL |