Developed in cooperation with the U.S. military, government agencies, universities and others, this insect repellent offers superior protection from disease-carrying biting insects. The active ingredient is permethrin, developed from a substance called pyrethrin found in certain flowers. Not only does this product repel insects, but it actually kills ticks, mosquitoes, chiggers, mites and more than 100 other kinds of insects. Sawyer Duranon repellents are not for use on skin, but on your clothing, tents and other gear. A single application can last up to six weeks and will remain effective even if you wash the garment once a week. Permethrin is odorless when dry, and during the drying process it chemically bonds with the fibers of the treated garment, but will not stain or damage clothing, fabrics, plastics, finished surfaces, or any of your outdoor gear. Available: 9-oz. aerosol can, 24-oz. spray, 9-oz. aerosol can 4-pack, 24-oz. spray 4-pack.