As previous posters alluded to, the back of this shoe is extremely irritating to one's heel. I wore these for a few days and they were not great, but weren't awful. I brought them with me on trip to Thailand, and after one day of wearing them in anvery hot, humid climate, had absolutely the worst blisters I've ever had. So bad, in fact, it required a trip to the ER for an infection.<br /><br />These shoes may be fine for a moderate climate, but absolutely do not buy these if you are going somewhere hot and humid. They are far too clunky and closed to provide any air to you feet. I've thrown them out.