I normally wear a size 8.5 or size 9.  I ordered these in size 9 because I have another pair of Skechers Shape-ups in size 9 (athletic version).  I was really surprised to discover that these sandals were way too big.  There was at least an extra inch of room in the toe area.  They are comfy and I've found that the sole feels more squishy than the sneaker version.  I like them and will consider ordering a 1/2 size or even a full size smaller.