Endura-Nylon U.S. Flag for outdoor use with 5 rows of extra vertical stitching. 3' x 5' Polyester. Our Poly-Max Flags are crafted using 2-ply 100% polyester bunting. The open weave construction reduces wind resistance, increasing ag life. Poly-Max material is extremely durable and ideal for commercial applications and high wind areas. Finished with white poly-cotton header. Includes ADDITIONAL zigzag stitching reinforcement: 4 vertical rows on y end & zigzag stitching on y end corners.