My foot is a little narrow, so I had to adjust the strap quite a bit; otherwise they are so comfortable that when I put them on, I didn't want to take them off.  And they are a little big, so go half-size down.  I wear a size 10 and would love it if they were available in a 9-1/2 since that size would fit me perfect.  But they don't make half sizes, so I had to stick with the 10, which is why I gave it 4 stars - they run a little big.  With the top strap, there's about 1/2 inch of room to spare so this is probably good since it doesn't rub against my big toe.  I wear these w/jeans and they would look good with dresses too.