The oofos are very comfortable, this is my 3rd pair.  I intend to return this color, Violet, because it is not the tone that I expected.  I hope to exchange for another color.  I generally wear a 9-1/2 and my first pair is a 10.  The 2nd and 3rd are size 9 and I feel they fit best in the length.  Oofas seem to be a bit narrower than many flip flops and fit much better for me.