It looks a lot like my overshoes. I got mine last year but they are discontinued. My climate is similar to yours, a little colder (Missouri). I really like them.

I found it difficult to know what size to get. I went by the sizing chart--I wear 9 1/2, so I got the size that was in that range. It did not fit over my shoes at all. I'm not sure if the sizing chart is supposed to indicate that Medium fits OVER shoes with that size range, or that it Medium is the SAME size as shoes in that range--if the latter you'd have to get a larger overshoe of course.

Even Large is a stretch to fit over my shoes.

So it took a couple tries, and this is where buying online isn't so great, because you have to send stuff back if it doesn't fit, but eventually I got the right size.