Our bands have been tested to fit all sizes of Apple watches and all series, the larger face sizes will have a tiny gap on the sides noticeable only if you're looking for it! Fits sizes: 38mm, 40mm, 41mm, 42mm, 44mm, 45mm S/M Band fits 6"- 7½" wrist Band Width: 1" Approximately 3" in Diameter Adjustable Band