Developed in cooperation with the U.S. Military, government agencies, universities, and others; this Sawyer Clothing repellent offers superior protection from disease-carrying biting insects. The active ingredient, Permethrin, is a synthetic molecule similar to those found in natural pyrethrum which is taken from the Chrysanthemum flower. Not only does this product repel insect, but will actually kill ticks, mosquitoes, chiggers, mites and more than 55 other kinds of insects. Sawyer Permethrin insect repellents are for use with clothing, tents, and other gear. A single application lasts 6 washings. Permethrin is odorless when dry, and during the drying process, it tightly bonds with the fibers of the treated garmet. It will not stain or damage clothing, fabrics, plastics, finished surfaces, or any of your outdoor gear.