I love these; they're so comfortable!  However, maybe it's me, but plastic sandals make my feet warm and sweaty.  I prefer to wear them with a 'foot' sock; the kind that cover just your heels, toes and the soles of your feet.  The upshot for these sandals is they are excellent for outdoor water activities, such as bathing a dog, washing a car or gardening.  Once done, it is best to hose them down and air dry properly (Lysol spray is a good idea too,) to prevent odor and mold from building up inside the grooves of the sandal.  That said, these are really comfortable to me, especially with a foot sock.