If you enjoy the comfort and style of Tevas or Eccos, these are not for you. The fit is very very wide, and the toebox is low.  Keen's advice is to order a size larger, but that doesn't help the low toebox problem.  Plusses: they do protect your toes (while cramming the nail).  They withstand wet weather.  They are apparently indestructible.  They offer enough protection that you can wear them in the winter, provided you aren't actually stepping in slush.  Minuses: they are really ugly.  They make my feet look big, sort of like Sasquatch.  Keen makes two styles that aren't quite as ugly (Rose and Bali), but only in limited colors and the popular sizes (7 - 9) are often unavailable.  These will make your feet sweat, but this can be countered with foot powder.  They aren't really a sandal; they are a shoe with holes in the side.  They are very difficult to get on and off, until you discover the trick of putting your index finger through the loop at the back and pulling with all your strength. Why did I buy and then keep them?  I have a deformed toenail and I need to hide it, at least until it grows out..  Then I can go back to my comfy and pretty Tevas and Eccos.