Make a headnet. You can hand sew one easily enough (may be ugly as sin though without practice haha), if working with a sewing machine is too daunting. Spray with permithren if you want or need extra protection from bugs.
As for the dangers of permithren:
If you live in a city, you're exposed to thousands of carcinogens and other toxins on a 24/7 basis at dosage levels many would consider "unsafe."
Hell being overweight is a worse risk factor for cancer and disease than permithren exposure.
If you're in the woods your carcinogenic exposure is reduced dramatically (you still brought food from the city...usually). A little permithren exposure over the short term is minor compared to one's (sub)urban day to day lifestyle and environment.
In exchange for that low exposure risk you increase comfort (which is a personal preference) and significantly decrease your disease exposure (west nile, lyme disease are concerns in the US...obviously worse diseases if you travel to the tropics).
It's fun to improperly weight risk factors and become hysterical over minor but scary concerns. All while ignoring the constant and persistent threats that we face daily. Unfortunately it's just not very helpful or constructive for improving the public health.
If you live in rural area upstream and upwind from any commercial agriculture, mining, manufacturing, energy production, or transportation center, have a low waist to height ratio, and eat only free-range and organic food with a constant rotation of diet to avoid estrogen precursors...then my previous statements don't apply to you.
Everyone else, nothing wrong with educating others as long as you don't get pedantic about your "opinion".