The watch band is well made, attractive as a sport band, and well priced. I took a chance and ordered two and am very satisfied with them. The 18mm dimension refers to the mounting lugs of the watch, which the attachment strap is sized to fit. The watch band, itself, is 25mm wide. The length information in the description is incorrect. The minimum wrist circumference it will fit is 7" rather than 6" (the construction prevents it from going smaller than that). However, for a wrist less than 8", a portion of the end of the strap will be beyond the velcro attachment and just lay on the decorative leather square. In that case, it's possible that it could catch on things or get bent and stick out. The strap could be trimmed, but you would want to stitch or glue the cut end so the layers don't separate. Realistically, if you have a small wrist (less than 8" around), just pick a different band (many nice bands have comments that they were too small, which would be what to look for if you have a small wrist).