I've been looking at these for awhile now and when they went on sale I couldn't pass up the excellent deal! I purchased both the 7 and 7.5, my regular size is a 7-medium width. I'm so glad I purchased the 7.5 because the strap over the toes is a narrow and the size 7 was too tight. Unless you have a skinny foot I would suggest going up 1/2 size. Also, there was no difference in the sizes when it came to the room in back of the shoe, I have the same amount of room at the heel in the 7.5 as the 7.