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. All these flags have sewn stripes and embroidered stars. The polyester fabric looks like a coarse cotton. They are designed for outdoor use and will resist fraying. We have found these flags to be durable and consistently high quality and free from defects.