Absorbine UltraShield EX Brand Residual Insecticide and Repellent Ultrashield ex is the first weatherproof, sweat-resistant formula that can provide 17 days of fly control It's the hardest working insecticide-repellent around and it can even be used on dogs The most advanced, ready-to-use fly, mosquito and tick repellent available Sweat-Resistant, weather proof and contains two sunscreens Kills and repels insects for 17 days, including mosquitoes that transmit west Nile virus