I wear size 81/2 and have thick feet with a high arch, I ordered size 8 because people said order by length not width, and I usually wear an 8 in regular Crocs. However the style of these is more slender and shallow, and I would need at least the 9 in this. I felt the bump under toes was too short for my foot in the 8 so the length is probably a true 8, ...I am returning because too short and shallow for comfort. A 9 would probably work fine, but now I'm a little gun shy about trying this style again, tho they are just as pictured.