I bought a size 6 because that is the smallest size that is offered, though I actually wear a 5-1/2.  I'm not UNhappy with these flip flops, but they certainly are running shorter and narrower than the size 6 Teva Classic Mush flip flops that I bought a couple of years ago.  Also, the strip that goes between the toes is a little less comfortable than the ones I bought a couple of years ago. Thank you for the opportunity to review this item.