This Shade Sail is heavy duty and very well made.The grommets are heavy duty too.Very thick plasticy woven material.Great color! I gave it 4 Stars because it comes folded tightly in a wad.The creases do not come out even after 2 weeks. I use mine as a  curtain simply hanging on a clothesline. But I think if it were stretched tightly,there would still be very noticeable creases.Maybe someone else will Post pictures to compare