apple watch straps

I suggest you click own the link I gave you above and then select the 42 mm case size. In most (if not all) bands, the 44 mm case size will be shown in the compatibility section when you click on a particular watch band.

If you buy a band and its doesn't fit, you have 14 days to return it and request a refund for any reason.

Returns & Refunds - Shopping Help - Apple

You can match most bands with any Apple Watch Series 3 or newer case of the same size. (For Apple Watch Series 3, the 40mm band works with the 38mm case; the 44mm band works with the 42mm case.)

The Solo Loop and Braided Solo Loop bands are only compatible with Apple Watch SE and Apple Watch Series 4 or newer. Bands will only fit the selected case size and are not compatible with other case sizes. For example, a size 5 for a 40mm case does not work with a 44mm case, and vice versa.

For more info, see:

Buy Apple Watch Bands - Apple

It will fit perfectly.