Developed for the U.S. military, 3M Ultrathon Insect Repellents create a barrier on the skin to repel biting pests such as mosquitoes that might carry West Nile virus, ticks infected with bacteria that can cause Lyme disease and Rocky Mountain spotted fever, plus flies, chiggers, gnats, and more. Controlled Release Technology allows repellents to evaporate slowly for protection that lasts a full shift on the job. Ultrathon aerosol contains 25.00 percent DEET (N, N-diethyl-meta-toluamide) and lasts up to 8 hrs. Rub-on lotion formula contains 31.58 percent DEET and gives up to 12 hrs. of protection. Mellow-scented products also resist perspiration and humidity as well as rain andsplashes.