Stetson’s No Fly Zone hats repel insects. The material is treated with Permethrin. Permethrin repels mosquitoes, ants, ticks, chiggers, flies, and midges. The Permethrin in the hat is bound to the fabric and remains effective for 70 washings. For protection of exposed skin, use in conjunction with an insect repellent registered for direct application to the skin.

No Fly Zone is EPA registered and is a unique patented process and uses a proprietary binding system of the repellent to the fabric. Permetherin is recommended by the CDC and WHO.