Smartwatch Bands & Straps

Buying a band is almost entirely about getting the size right, and Apple’s naming makes that less obvious than it should be.

The number on a band — 38, 40, 41, 42, 44, 45, 46, 49mm — refers to the case size the band fits, not the strap itself. Bands are made in two width groups and are interchangeable within each: the 38/40/41/42mm group and the 42/44/45/46/49mm group. Note that 42mm appears in both, because Apple has used that case size in two different generations with different band widths. Check which watch you actually have rather than matching the number alone.

Then the length: Sport Bands come in S/M and M/L, so check your wrist against the stated range.

The styles suit different use. Sport Band is smooth fluoroelastomer, best for exercise and easiest to wipe clean. Sport Loop is soft woven nylon with a hook-and-loop fastener — infinitely adjustable and the most comfortable for sleeping. Braided and Milanese styles suit everyday wear.

See also smartwatches.