Wow...these are completely unwearable.  I have a very regular sized calf and foot...never have issues.  I could hardly get them on in the first place...then once on, I was a good inch off from being able to zip them.  I read reviews on many of this type of boot and decided to take the chance on these, but they don't work....so none of the others will, either, probably.  I have a high arch, so that is why I had a hard time getting my foot in at all...then as stated, couldn't zip. Too bad!