I love this shoe. I have one of a different color, but the first time I ordered it, I ordered a US size 6.5. I don't think it was from the same seller, but I received a US size 9. I didn't even try to return it. I just ordered another one. At first, because it said size 4, I thought I received another incorrect size. Watch out. The shoes are sized as UK AND US so they differ. At first I thought I received an incorrect size and was pissed. But further examination, the shoes are indeed a UK size 4, and a US size 6.5. Just be very very careful. The shoes are very comfortable. Because I work in a health care setting, I have to wash my shoes every day when I come home. These have held up.