They are. Thanks for pointing them out.
But are they meant to be casual? They do to me but they appear to be narrow like a dress belt. Oy.
There's quite a bit of flexibility as you can imagine, given that you can insert the prong between any of the links. We'd recommend S for a typical 30-32, M for a typical 33-35, L for a typical 36-37
Around the waist !