It's polyester.  Thin, but not stupid thin.  We're using indoors until I find the perfect style, then will exile to patio.  This is exactly like the picture.  A value at the$100 I paid, would not be happy if I'd paid more.  There is a new rug smell that was really tough to overcome.  Took a week to go away, but I really didn't treat it...might have been better had I done.