Ozone friendly aerosol spray with 20 deet for medium protection the insect repellent factor is a quick and easy way to choose what repellent you need to protect yourself from mosquitoes midges and other biting insects the higher the irf174 the better the protection insect repellent factor up to 8 hours medium protection for use in countries with no known risk of malaria or other insect transmitted disease ideal for home and short haul beach holidays for adults a