Insect repellent spray features a 25 percent DEET formula that resists sweat to remain effective for up to 10 hours. Advanced formula repels mosquitoes that may transmit Chikungunya virus, Zika virus, Dengue virus and West Nile virus. Cutter Backwoods Insect Repellant also protects you from ticks, chiggers, gnats, no-see-ums, fleas and biting flies. Aerosol formula makes application easy and is perfect for prolonged outdoor activities.