Careful, if you read the label on a permethrin bottle, it will specifically say not to apply it to anything that has direct contact on your body. Specifically -

Careful, if you read the label on a permethrin bottle, it will specifically say not to apply it to anything that has direct contact on your body. Specifically -- hats, socks and underwear. You really don't want this stuff on your hat. It also says not to spray it indoors, to not breath in the spray, and to let your garments rest for at least 4 hours indoors or 2 hours outdoor before putting them on. Permethrin is powerful enough to still work after 50+ washes, be careful how you're using it.