OK, no big surprise.  A clog without any ventilation on the exterior of the shoe is going to be kind of hot...  That said, I love everything else!!  True to size.  I can wear these puppies all day on concrete floors with absolutely no problem.  I love that they are nice and wide at the forefoot to accommodate my feet swelling a little, but not too wide.  They stay on when I am walking/jogging/sometimes running down the hall at work.  Not slippery on wet flooring.  Shoe offers nice arch support and cushioning.  Overall a nice work shoe that I would purchase again :)