For the most part, you won’t notice a huge difference in the way polyester looks and feels when compared to nylon, but you will notice a difference in longevity. Polyester is designed to last a lot longer than nylon. As a matter of fact, we only recommend nylon if you’re planning on using your flag indoors, as it doesn’t stand up to the weather very well. Many flag makers are moving away from nylon and no longer offer it as an option because of its cost and poor durability. However, we like to give our clients as many options as possible, so we continue to offer this traditional flag material!