I ordered this boot in size 10, my usual size. With considerable effort I was able to cram my left foot in, but even with effort my right foot could not get past the ankle juncture of the boot. My left foot fit, lengthwise, but it was very tight & uncomfortable around the top part of my foot. I don't think a larger size would have helped because it probably would be too long.

I believe that I must have a high instep (not sure if that's the correct term, but the part of the foot that is raised by your foot arch). It hasn't been a problem for other footwear, but this boot did not work at all for me. It's a cute shoe, so if you have flatter feet it would probably be great but for folks with "tall" feet, it's going to be a problem.