Actually, they were originally brought out at the exact same time. I bought mine 2 summers ago and had a choice between the heel or the other really flat one.yes both exist; the pair without the heel were the original flats; the one with the heel came out more recently; I had an SA at Nordstrom that found a pair this summer; the one with the heel I found to fit better...it was a slightly larger fit than the original one in the same size