This cool looking watch band makes you look and feel great! It grows from about 2.5" (6.4cm) wide to over 3" (7.6cm). The base is 5.75" (14.6cm) for the "Small" and 6.5" (16.5cm) for the "Large" size, so depending upon the size of your watch, generally choose "Large" if your wrist size is between 7.25-8.5" (18.4-21.6cm) and choose "Small" if your wrist size is between 5-7.25" (12.7-18.4cm) For very large or small watches, adjustments will need to be made. The 1" (2.5cm) straps can be easily trimmed if necessary if your watch isn't quite that wide to make it fit. You won't go wrong with this watch band!