Manna Pro Opti, Nature, and Pro Force Sprays, Wipes, and Food Additives. Sweat resistant Fly Spray Provides repellency and quick knockdown from biting and nuisance flies, gnats and mosquitoes (Culex spp.) that may transmit West Nile Virus 14 Day weather resistant protection For use on horses and ponies Available in 32 oz spray and gallon