The BugsAway Baja Sur, featuring Insect Shield® technology, and is lightweight and quick drying. It also features a button down collar, security zip pocket and adjustable mesh ventilation at the side and arm to keep you cool. 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.