Pesticide-Free - Water-Based, Alcohol-Free - Non-Irritating, Long Lasting - Herbal Fragrance. Repels all major fly species and mosquitoes naturally without the use of harsh chemicals or pesticides. Pleasant herbal fragrance. Easy to use. No mixing required. NaturVet's Natural Fly Repellent is a unique combination of Citronella, Rosemary Oil and Cedar Oil that repels flies without irritating horse's skin. The water-based formula will not sting open wounds or pre-existing insect bites.