Ultrathon™ Insect Repellent was developed for and used by the US Military for over 20 years to fight the pests that the troops encounter in some of the world’s harshest environments. Today, outdoor enthusiasts count on its Unique Time Release Technology. Ultrathon's Time Release Protection gives the user a balanced mix between concentration of DEET and long lasting protection. Our unique technology provides longer lasting protection with less DEET. Plus, it’s splash- and sweat-resistant, so you only have to apply it once. Repels: Mosquitoes, ticks, biting flies, chiggers, gnats, fleas, and deer flies. The aerosol contains 25% DEET, sprays upside-down for complete coverage, and provides up to 8 hours of protection. The lotion contains 34.34% DEET and provides 12 hours of coverage.