This spray combines three naturally derived fatty acids carried in a silicone base rather than pyrethrins or essential oils. Once applied, the carrier evaporates from the hair coat, leaving the fatty acid blend behind to create a zone that interferes with how flies, ticks, mosquitoes and lice locate their target. The 18 oz bottle is meant for topical use on horses and cattle and is applied with a small handheld sprayer suited for oil-based liquids or with a soft cloth, focusing on the legs and lower body. It should not be diluted or mixed with soaps, detergents or other skin treatments before use. A single application is formulated to remain effective for one to three days depending on conditions such as heat, humidity and rainfall. Care should be taken to avoid the eyes and ears during application, and the product should not be applied while an animal is sweating heavily.