The Thin Green Line. Show your love for the men and women who work tirelessly to protect and preserve the beautiful landscape of our great country. Fly your Thin Green Line flag proudly to show your support for the military, border patrol, and the preservation of the wildlife of our nation. The Thin Green Line will always stand as strong and united as the country they protect. This flag is made from our renowned DuraSleek Nylon material and is great for flying on a pole outdoors.