Sizing on bands questions

I've looked around and can't seem to find the answer to this. I know on the sports bands they will fit up to 210mm however is that including the watch face, the 38 or 42mm? I can't seem to find that answer anyplace. Reason I'm asking is cause I've used the pebble Samsung gear and gear s and all have fit. However 210mm will not which I find interesting because all the other smart watches I have never had a issue with.