Measurements are done on a 40mm lug-to-lug watch.
Strap length or Long/Short part length excluding the buckle.
Choose your wrist size on the scale and follow the line to see
which strap size has fastening holes allocated closest to the line that matches your wrist size
The fit may differ due to the watch size, lug, and wrist shape.
Do not opt for the size, if your wrist size line is close to the first or last sizing hole.
Feel free to contact us for assistance.