Alright, I waited until the end to buy these because no one who had reviewed answered my questions about HOW small the calves were.  There are people who are 5'1" and quite a bit heavier than others who are 5'1".  Here are dimensions that might be helpful:  My calves are 12" to 12 1/4" at their largest point (I know, pitiful legs).  I think that anyone with calves that are only an inch or so bigger than mine would be fine, too much bigger and you'll probably find them uncomfortable once you put the jeans in them.

That being said, I think these boots are great!  Definitely would have preferred the black or the red but I'm okay with the grey.  One thing I did was to remove their grayish ribbon and put in a nice wide bright red one - helped the look quite a bit.