I love these shoes but I sized up like other customers stated. All seven of my other FiveFingers are a size 38. These I ordered a size 40 and they fit tight to my foot but comfortable (the way my 38s in other styles fit). The strap is not long enough for a wide width foot. I will have to do some redesigning and sewing to be able to use the strap. I wish Vibram would realize that not all of their customers have a narrow foot. However, these are very comfortable and I would buy again.