Sawyer Permethrin Clothing Treatment - Permethrin is a contact insecticide. That is, it kills ticks or other insects when it comes in contact with them. It is used on clothing and materials. It uses the same active ingredient used in hair shampoos for head lice. When applied to clothing the Permethrin binds to the fabric eliminating the risk of over-exposure to the skin.As a clothing, tent or sleeping bag application, Permethrin is very effective at keeping ticks from attaching to you and at reducing the mosquito population in your camping area. Permethrin is also an effective repellent against mosquitoes and flies and can be used in conjunction with a skin based repellent. Permethrin can be used as the primary repellent if the exposed skin area (gaps in the treated clothing) is not too large. By storing the treated clothing in black plastic bags between uses the protection can be extended considerably.