Is it ok to wear SWIMS galoshes over leather shoes that have rubber soles?
These are the shoes I want to use them on:
The main reason is that here in Toronto, even on dry days, sidewalks can be covered with road salt that was laid per-emptively due to anticipated snow and ice.
The main benefit of overshoes is they stop saline water wicking up through the welt and damaging the uppers. With a rubber sole being impermeable there is no discernible wicking effect.
There is a secondary benefit of swims which is they cover the uppers and protect from spray but in terms of salt this is secondary.
So if the aim is to protect from salt damage, you should be fine with just a rubber sole. If it's bad enough to wear swims over a chunky rubber sole perhaps you should just look at something more practical for poor weather and carry dress shoes in your bag?