I have thicker calves and still took a chance on this boot despite the reviews about how narrow the shaft is. I knew that the boot height (listed at 12.5 in. from arch) does not hit the thickest part of the calf. I'm glad I took the chance! It fits perfectly well, though I did buy an 8 because of suggestions instead of my normal 7. Trust me when I say that this boot does run one full size small so do size up. The boot is gorgeous rich chocolate and it feels very good and comfy on. I recommend that you take a chance on this boot too!