The BugsAway Sandfly Pant, featuring Insect Shield® technology, has a mesh inseam panel for insect protection on hot days. It features roll-up snaps and an Indestructible Button System that keeps your pants where you want them. 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.