When you want to protect your horse in hot or humid conditions, UltraShield® Sport sweat-resistant fly spray works as hard as you and your equine partner. Provides sweat-resistant protection for heavy workouts in the hottest, most humid weather - won't sweat off. Repels and kills mosquitoes that may transmit West Nile virus, as well as protecting against biting and nuisance flies and gnats.  The water-based formula won’t attract dust.  The long-lasting repellency protects and stays active for up to 14 days, even after rain.  Available in a quart sprayer only.