Stop the Biting Deer Flies!
Deerflies are found from May to September in most marshy and wooded areas. Up here in the Boundary Waters they like to hide out in the shade and then swarm around your head before they pounce and bite.
Just stick the deerfly patches to the back of a cap or hat. One patch generally lasts a day. Non-toxic, chemical-free and odorless.
Not recommended for long hair that might blow around and get trapped on the patch's special adhesive.