The lightweight BugsAway Damselfly Pant, featuring Insect Shield technology, features roll-up snaps and a drawcord waist so you can customize the fit. 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 through 70 washings.