New band
I want to buy an Apple Watch band
Can I buy one online.
Apple Watch Series 3, watchOS 5
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Bands are not specific to a model of Apple Watch, they are designed for watch case sizes. Find one for the case size of the Series 3 Apple watch you have, 38 or 42mm, or a band that fits those sizes.
You can match most bands with any Apple Watch Series 3 or newer case of the same size. The 41mm bands work with 38mm and 40mm cases; the 45mm bands work with 42mm, 44mm and 49mm cases.
The Solo Loop and Braided Solo Loop bands are only compatible with Apple Watch SE and Apple Watch Series 4 or newer.