Polyester Set includes two 15" x 15" round seat cushions with a plush, overstuffed construction for enhanced comfort and longevity Cushion cover is made from 100% outdoor polyester fabric that is UV, water, stain and fade resistant Filled with a soft polyfiber material made from 100% recycled, post-consumer plastic bottles Attached string ties help keep cushion securely attached to outdoor furniture, while the circle tack construction prevents cushion fill from shifting and bunching For best results, and to extend the life of your cushions store covered when not in use