Endure provides up to 14 days of fly control. It contains RepeLock, a special conditioner that binds to the hair and won”t sweat off. Endure protects against biting and nuisance flies, gnats, mosquitoes, deer ticks and lice. Also repels and kills mosquitoes that may transmit West Nile Virus. Endure has included sunscreen for protection against both forms of harmful rays. Active ingredients are cypermethrin and pyrethrin.