These take a while to get used to but they are the most comfortable flip flops ever!  The ABF technology takes a while to get used to because the soles are not perfectly flat, but they are so comfortable once you get used to them!  these shoes also mold to your feet...and the crocosite keeps the shoes smelling fresh!  Other reviewers are right, these do run hal fa size large. I have wide feet and usually wear a size 5.5 in sandals. I got the size 5 and it fits perfectly.