Leg boots are really tough to fit.  This one fit me perfectly, which is a miracle not trying it on.  It really helped reading other people's reviews.  One complained that the boot came too high reaching the knee, since I'm a bit taller at 5'6" I thought I'd give it a try.  My calves are not big enough to order "extra wide calf" boots but not skinny either, so am so thankful this one fit!