The No-Fly Zoneﾙ ACU is constructed to military specification GL/PD 07-14 and treated with the active ingredient Permethrin, a man-made insecticide that effectively repels mosquitoes, ants, chiggers, flies and midges. It offers 99% protection over an 8-hour period (when combined with 35% DEET on exposed areas of the skin.) Registered with the EPA and tested by the U.S. Military.ﾠPermethrin remains effective for 25 launderings.