S: 18.5 cm/ 7.3 inch closed - 56 gr.
M: 19.5 cm/ 7.7 inch closed - 58 gr.
L: 21 cm/ 8.25 inch closed - 61 gr.
Sizes are measured from end to end of the bracelet, so if you measure your wrist circumference, recommended size would be about 3 cm more, for example, if your wrist circumference is about 18 cm, choose 21 cm.
If you like a tighter fit around your wrist, go up about 2-2.5 cm, if you like it loose, go up about 3.5-4 cm.