SIXSTARS Book Club Reading Group Reading Book Group Throw Pillow 18 X 18 Square Cotton Linen Pillowcase Cover Cushion 50% cotton & 50% polyester. Eco-friendly and durable. Real Touch Sensitivity for a natural feel. Zippered pillow case, with a zippered opening on the side. The perfect complement to your couch, SIXSTARS cushion covers will make you the envy of the neighborhood .