Repels mosquitoes that may carry West Nile Virus. Sprays upside down too! Provides hours of effective protection from mosquitoes, gnats, and biting flies (sand flies, stable flies, and black flies). Also repels ticks, chiggers and fleas from treated skin and clothing. Off! Active Insect Repellant I is not greasy, won't stain and resists perspiration. Contains no CFCs or other ozone depleting substances. Federal regulations prohibit CFC propellants in aerosols.