In areas of extreme bug density or other extreme conditions you can rely on this 100% Deet spray for application to clothing or head nets. It should be used on the skin only for extreme conditions. Formerly known as N,N-diethyl-m-Toluamide, DEET is by far the most commonly used insect repellent in the world because it is the most effective repellent against mosquitoes and ticks. Sawyer Maxi-Deet Contains undiluted Deet and NO alcohol.