U.S. Reinforced (2-Ply Polyester): Our best US flag with excellent wear characteristics, that includes deep colors that reflect light and very good color retention. Reinforced unilateral chain-stitching with color-matched polyester thread, individually sewn stripes and embroidered or printed stars. Quadruple stitched fly-end including x-box reinforced corners. Heaviest canvas heading in the industry. Canvas heading and brass grommets for small US flags, chrome D-rings for large us flags.