They have a narrow line in the box....NARROW! Probably will open over time of course. In front is a very comfortable shoe and generally the foam on the sole gives a comfortable walk. Get a size bigger.

After a month I can say that I no longer feel it on my feet. It opened as needed to walk comfortably but without fear that it will come off. It is far more comfortable than NIKE Air Max and the best part???? It has incredible grip!!! Even on wet shiny sidewalks you literally hear it suctioning for fractions of a second. Simply incredible!!!

Very comfortable to wear, feels like you're not wearing anything at all. The first few days are tough until they stretch out because they fit like a sock, but afterwards they are very soft.