Insect Shield by White Sierra Hood Pullover Burgandy “Redwood” Bug Free Base Camp Shirt New with Tags MSRP $60 * Permethrin is a synthetic pyrethroid insecticide that acts as a neurotoxin to insects. It is widely used for two main purposes: as a topical medication to treat scabies and lice in humans, and as an insect repellent and killer for clothing, camping gear, and agriculture