Note: The sizes are based on shoes after they are slightly broken in. When they arrived they felt quite tight, especially at the balls of the feet. I was a little worried because I usually wear a size 11.5E and this size is out of stock. However, after a few days of wearing they have stretched a lot and now fit very well, not too loose and not too long. The only caveat I would warn is that the lugs on the sole are very high and the lateral support of the shoe is almost non existent making it easy for the heel sole to snag on something or slide sideways and twist your ankle during Walk. As a driving shoe they are excellent, they hold the pedals great even for a manual car, light and soft so they don't feel too bulky or bulky and the heel pods provide enough traction so your feet don't slip unexpectedly when shifting gears or heavy brakes. I recommend wearing very low socks that only cover the toe and heel. Shoes don't really have enough ventilation (even with perforated soles) so walking without socks becomes sticky.