For a company that has historically kept their product lineup relatively sparse, the Apple Watch represents an entirely new direction for Apple. And rightfully so, the Apple Watch, as a personal fashion item, effectively demands a variety of designs and sizes.

The Apple Watch will launch in two distinct sizes, a 38mm case and a 42mm case. To help users more accurately determine which size is more appropriate for their wrists, Apple has put up a handy Apple Watch sizing guide to help prospective buyers make as informed of a decision as possible.

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Notably, it seems that there’s a lot of size overlap between the 38 and 42mm sizes, which is to say that you probably don’t have to worry about picking up the wrong sized band. Of course, your best bet would be to make a reservation at an Apple Store in early April and try on a few for size.

Apple Watch band sizes