"I tried a size 8 on in store, but they were a bit too tight. I decided to order an 8.5 thinking that they would fit perfect. Nope. The 8.5 flop off my feet and within 2 hours I had to put on a back up pair of sneakers that I leave at work. I only walked from my car to the bus and then the bus to my work (very short distances). I sit for work so it is not as if I was walking around much...I don't understand why they are so big or why they rubbed my feet raw in 4 places (back of both ankles and on top of big toe) even with a ballet flat nylon liner. I plan on taking these back tonight, but I read the exchange policy and they are to be unworn...hmm, kind of hard to gauge comfort without wearing them. We'll see what they say tonight!"