I ordered this a size up from what I normally wear. I usually wear an 8-8.5 which would be a 38 but I ordered a 39. This style is kind of narrow in the toes not a wide roomy box fit like most clogs. The length is a little longer than the back of my heel but with us if the back strap the fit is perfect without being too snug. If you don't mind it being snug in the toes and don't plan to use the heel strap, then order your correct size. Otherwise order a size up..love the style, design and comfort though.