ULTRATHON INSECT REPEL SPRY Ultrathon is the longest lasting and most effective insect repellent on the market today. It repels mosquitoes for over 12 hours and ticks for over 9 hours and is also effective against biting flies, gnats, chiggers, and fleas. Contains 33% DEET in a controlled-release polymer. Moisture resistant-lasts through splashes, perspiration, and rain. Comes in a 2 oz. Tube or spray.