The heel tab that sticks up a quarter-inch in the back is a real nuisance. You don't notice it initially, but after walking a little bit, it starts to rub, then it starts to chafe some more, and then after 20 or so minutes it's starting to turn red and close to bleeding. Had high hopes these would be comfortablebecause isn't the whole point of Crocs all about comfort?!but that couldn't be further from the truth. I honestly don't understand how more people aren't bothered by it (and it has such a high rating, too), but the discomfort level is very high after a short walk. I tried cutting it off as others had mentioned, but that didn't solve the issue and only aggravated it since I couldn't get a clean, smooth, non-abrasive surface line in the back and is still cutting into my skin. I barely walk at work and they've already become uncomfortable by noonthat's how bad they are! If I didn't step into some wet yellow paint in a parking lot the first day I wore them, I would've tried to return them. And donating them seems like cruel and unusual punishment to the next wearer.