4ft x 6ft Sewn Polyester US Flag (flags connections Brand)-Spun Polyester is the most durable flag on the market. The open weave reduces fabric stress and resists high winds. These flags are the best choice if you fly the flag 24/7 and your wind speed is higher. As these flags are made from heavier fabric they require a higher wind speed to ""fly"" than nylon flags. Also they require more effort to put up and take down. The polyester fabric looks like a coarse cotton. They are designed for outdoor use and will resist fraying. These polyester flags have sewn stripes and embroidered stars, and are very attractive. They have canvas headings reinforced with rope and brass grommets.