Add an array of infrared LEDs to your hat to create an invisible mask. Infrared LEDs are invisible to the human eye, but are visible to cameras. Thus, if you throw a dozen of them on your hat, they blind security cameras and hide your face. We know that IR Leds are great for night vision, but they can also easily blind cameras. Hopefully some new security cameras will be able to resist this trick so criminals aren’t totally incognito.