The Made in USA Tick & Insect Repelling Gaiters is made with No Fly Zone material. This material is treated with permethrin that is embedded to the fibers of the fabric when woven in the North Carolina plant. The result is a safe and effective method to repel ticks, mosquitos and biting insects. No Fly Zone material is recommended by the CDC and World Health Organization for pregnant women and children to protect against insect borne illness – the highest standard of safety.