I ordered this flip-flop from Planet Shoes and I'm sorely disappointed.  The sandal was easily a size too small, and given that Planet Shoes charges $6.95 to return the item for any reason, it's not worth it for me to even try to order the next size up.  Plus, the toes are extremely thin, and if you're flat-footed like myself, the toes are the first part to wear out.  Beware this sandal.