Size Guide
Lug Width
Your lug width is the internal distance between the lugs the two points where your watch strap connects to the case. This measurement (in millimetres) determines the correct strap size for your watch.
For example: A lug width of 20mm requires a 20mm strap.

Wrist Size:
Add the "Total Usable Length" figure in the Product Specifications to the size of your watch. The result will give you the wrist size range of the strap when used on your watch. For example: a strap with a total usable length of 130-175mm placed on a 40mm watch will fit wrists between 170-215mm in circumference.