I am extremely picky about footwear due to high arches. It's so hard to find shoes/boots that are fashionable and comfortable. Cole Haan's has become my go to brand and with Nike Air these boots are a great find. Super comfortable and light and bonus they look gorgeous.  I usually wear 7.5 or 8. I ordered an 8 in this one and it fits great. Also like the others have pointed out there is no zipper. Calf length was perfect for me- I have skinny calves. The rear of the boot is stretchable fabric so should fit most nicely.