This material is a woven two-ply polyester yarn that combines the strength of polyester with the additional richness of color. It also has embroidered stars, sewn stripes and reinforced fly ends. These flags are much heavier than nylon and require stronger breezes to wave the flag. Recommended flag size according to flag pole height: 3' x 5' flag for 16' to 20' pole, 4' x 6' flag for 21' to 30' pole, 5' x 8' flag for 31' to 36' pole. 100% Made in USA