Some mornings call for a proper shoe and your feet simply refuse to cooperate, usually the same week you've got a full day on your feet or a long walk you can't get out of, and that's when comfort boots come off the shelf before anything else gets a look in. They're the ones you grab when you know you'll be standing at a bus stop, then walking the long way round because the direct route has roadworks, then standing again, and you want to arrive somewhere without peeling your socks off under the table in relief.
They sit well against plain, slightly oversized basics, a straight leg jean turned up once, a long cardigan you can sink your hands into, a simple roll neck when it's properly cold, nothing fitted or fussy because the boots are already doing a job and don't need competing with. Before you buy, check the sole flexes where your foot actually bends rather than staying stiff through the ball of the foot, have a look at how the boot sits around the ankle bone because a lot of them rub there within the first fortnight, and check whether the lining is a proper fabric or just a thin sprayed finish that'll go hard and shiny by November. If you own none, start with an ankle boot in a flat or very low block heel, in black or a mid brown, nothing with a zip that looks like it's fighting the leather at the seam, because a zip that's slightly too tight for its own boot is the first thing to go.
The difference between one that lasts and one that lets you down is almost always in what you can't see on the shelf. A well made comfort boot has a sole that's actually bonded or stitched rather than just glued flat, which you can sometimes tell by pressing the edge with your thumb, and stitching along the upper that's even rather than wandering, because wandering stitching usually means wandering everything else. The leather or decent synthetic should have a bit of give to it straight away, not need six weeks of wearing in before it stops feeling like a plank. Cheap hardware on the buckles or eyelets will go dull and slightly orange within a season, so have a quick look at that before you commit, and if there's a zip, run it up and down once in the shop rather than assuming it'll behave at home. The insole matters more than people admit to themselves at the till, a flat thin one looks fine on day one and feels like standing on a book by day three.