The BugsAway Chas’r Crew Tee provides sun protection with a UPF 30+ rating, dries quickly, and wicks moisture from the skin. It also gives long-lasting, effective and convenient insect protection. Permethrin, the active ingredient in Insect Shield®, is invisible, odorless, and tightly bonded to the fabric fibers, and lasts the expected lifetime of the garment (70 washes). 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.