I took the advice of several other reviewers and ordered a 1/2 size larger than what I normally wear, and the shoes in that larger size fit just right.  It seems that winter has dragged on a bit, and these colorful shoes give me a smile and a lift when I reach for them.  One thing to be aware of is that the black top of the shoe is very "mesh-y" and allows a lot of air to get to your feet.  These are definitely not the shoes to wear in cold weather, but will be a lot of fun in spring and summer.