While this was a cute boot overall, the shaft is unbelievably tight! I could barely get these boots zipped up! I'm 5'9" and 120 lbs, so I have fairly slender legs overall, and I couldn't imagine these boots fit others properly. Yes, I'm a runner, so I do have some muscle on my calves, but I wouldn't say overly so. I 've never had a problem with boots not fitting my calves before. In fact, the exact opposite.  Maybe that's why they were selling for such a cheap price! It seems there is a design flaw here, because others have been saying the same thing.