I normally wear a size 9 in  Born shoes, but read the reviews, which said these ran small, so I ordered a size 10.  I am glad I went up a size as the 10 fit perfectly.  I returned them as the purple is strange and didn't match anything I own....it has multiple colors and pinks.  I did not like the way it looked on my foot as it is a thong and I like the base of my toes covered.