I wear them with my short boots, just for schooling & what not. If I wore my show boots all the time (like in lessons & stuff)- I'm sure they'd get ruined, & I'd have to polish them all the time! With my half-chaps, I can simply keep my showboots in good shape, & make my short boots look like tall ones. :) I have the Barn&Stable velcro ones, they are really good.
Nice & comfy, easy to get on & off.
Anyway, they also help with the stirrup leather rubs- your calf can sometimes get caught in that, & that's what the chaps prevent.