If you are tired of watching your horse being swarmed with bugs, equine insect repellant is the answer. All Terrain Equine Herbal Armor does the job with all natural ingredients.100% DEET-FREE; only natural ingredients used. Clinically proven to be 100% effective for over two hours, 95.8% effective for three hours and 77.1% effective for four hours. Unique formula w/five natural essential oils recognized by the EPA as repellent