The ARDEN Basics Outdoor Midback Dining Chair Cushion is made with long-lasting outdoor polyester fabric. This outdoor dining cushion measures 19.5 in W x 37 in L x 3 in H (Back: 19.5 in W x 20 in L x 3 in H and Seat: 19.5 in W x 17 in L x 3 in H). The 100% printed polyester outdoor fabric resists fading, so your patio cushion looks vibrant for longer. Two sets of ties make sure your outdoor midback chair cushion stays firmly in place. Inside this outdoor dining cushion is partially recycled polyester fill to help it retain its shape and provide long-lasting comfort during outdoor use. Although this cushion is water- and UV-resistant, we recommend bringing it indoors when it rains or is not in use to preserve its lifespan and keep it looking beautiful.