Super comfy, no frills, flat bottom, I got a 7 when I'm normally a 7 or 7 and 1/2- Maybe I should have opted up if I want to wear thicker socks or to fit my wider feet... but I still love them... makes me feel happy when i walk since you can feel the frays move too.  The zipper in the back can go down a little, I don't really notice that often.  I don't think they are waterproof so don't go jumping into any puddles.