3m ultrathon insect repellent containing only 25 deet ultrathon insect repellent provides effective protection for up to 8 hours against mosquitos from one application thanks to its advanced 3m time release technology when used as directed provides effective protection against bites from mosquitos midges ticks fleas gnats sand flies and horse flies suitable for tropical areas with a risk of diseases such as malaria yellow fever chikungunya fever dengue fever west nile virus and oth