This is incredible. For the last couple years I have thought of "inventing" a sticky hat cover for catching deerflies only to find I'm way too late. I hope I can find these patches locally. Everyday in the summer a deerfly will sit on the fencepost all day long and wait for me to get home from work. The instant I step out of the car it will slam against my head every three seconds until I kill it and then one of its brothers replaces him. Or at least that's what it seems like.
