I wear a US size 8 so I ordered the 39 (8-8 1/2) in pink. Thy were too long but I liked the color so much that I kept them as at home shoes.  Then I ordered a pair in size 38 & they were perfect! So they run a little big... I ordered 2 more pairs - all in different colors (including another pink in the correct size,) The width is marked as narrow but works fine for me.  Even with a small bunion I have no problems. The first day I felt like my feet had to get used to them but after that, all was great.  I think they'll last forever. Also it feels like the rubber material keeps your feet a little warmer than other sandals.