I bought these specifically because I read they were a good fit for someone with small/slim calves. And they really are! I have 12" calves-and at 5'6" that makes buying boots almost impossible. These were great. However- I will agree with most reviewers-go up half a size. I have very narrow feet and although I will be keeping the size 8's I purchased-the next pair I buy I'll be getting in an 8 1/2 for some wiggle room.