Whether you're in a buggy town or hanging out in basecamp, the ExOfficio BugsAway Talisman Longsleeve Shirt, featuring Insect Shield technology, is the perfect shirt to keep you looking good and protected at the same time. The comfortable cotton blend breathes and dries quickly for easy care. 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.