I have been using the Crocs-Athens flip flops for the past six years.
When I saw these ones, I wanted to try them and ordered a pair.
They are more comfortable, more cushioned, and more costly than the regular ones.
But, although I ordered the same size, they didn't fit. They were too small.
It seems that the Crocs Unisex Duet Athens Flip Flops run a size smaller than the regular Crocs Unisex Athens.