The BugsAway Impervio is Insect Shield® Repellent Apparel, and is crafted from a lightweight, moisture wicking and fast drying mesh that will keep you cool and comfortable. Permethrin, the active ingredient in Insect Shield, is invisible, odorless, and so tightly bonded to the fabric fibers that it retains effective repellency through the life of the garment. It repels mosquitoes (including those carrying West Nile virus and malaria), ticks, ants, flies, chiggers and midges (no-see-ums). Insect Shield repellent lasts 70 washings. Do not dry clean.