American flags are widely produced in two main materials: nylon and polyester. They both have their benefits and their weaknesses, and each is best for certain environments and uses.
Look and Feel
Nylon is lightweight and shiny. Its texture is slightly rough, and somewhere between fabric and plastic. On the other hand, polyester has a completely matte surface. It looks and feels like cotton, rougher and heavier than nylon and without a hint of shine.
Frequency of Flight
When choosing between a nylon flag and a polyester flag, it is important to consider whether the flag will be outside 24 hours a day, from sunrise to sunset or just on holidays. In general, polyester is a better and more durable choice for more frequently flown flags.
Nylon is lighter than polyester, and therefore flies more easily in areas without high winds. It is a better choice for areas like the suburbs. However, if you live by the sea or in another place with high winds and wet weather, polyester is a better choice.