Patented, ready-for-use water repellent formulation for use on horses. Bonds to the hair shaft to resist moisture and sweat. Kills stable flies, face flies and horse flies for up to 2 weeks. Prevents stable flies from feeding for up to 4 days. Does not leave an oily residue. Labeled for use on animals and livestock areas such as dairy barns, cattle operations, horse barns, poultry operations, hog operations, and kennels. Active Ingredient: Permethrin 1%. Does not sweat off.