Repel® 100 Insect Repellent provides you with up to 10 hours of protection against mosquitoes. Formulated for severe insect conditions, Repel® 100 Insect Repellent contains 98.11% DEET and repels mosquitoes that may transmit the Zika, West Nile, Dengue and Chikungunya viruses, as well as ticks, gnats, biting flies, chiggers and fleas.