I took the adivse of other peoples reviews and also acutally messured my feet per the Ryka shoe messurements.  I did order a 1/2 size bigger and glad I did , my norma size 8 1/2 would of been to small.  Just a fyi if ordering online - and maybe I didn't know this due to this is my first pair of Ryka.. these sorta remind me of a water shoe.  That is what the material is like on the top.  However.. i still love my pair, just different that what I have owned in the past.