I am typically a 7.5 or an 8 and ordered an 8 based on other reviews, perfect fit.  Great bootie, comfortable, snug with no gapping around the heel which is really nice.  I would have give this 5 stars however I ordered the navy expecting it to be a nice dark navy as the photo appeared but its lighter and not as rich in color as I was looking for.  Unfortunately I will be returning them.