The Arden Selections Outdoor Midback Dining Chair Cushion is made with long-lasting outdoor polyester fabric and partially recycled polyester fill, creating a comfortable cushion that is eco-friendly and skin-safe for your family. This outdoor chair cushion measures 18 in W x 36.5 in L x 3.5 in T (seat cushion is 18 in W x 16.5 in L and seat back is 18 in W x 20 in L). The 100% printed polyester outdoor fabric resists fading, so your patio cushion looks vibrant for longer. Water protection helps your Midback Chair cushion withstand continued outdoor use, while easy cleaning with just soap and water ensures low-maintenance upkeep. Four sets of ties make sure your outdoor cushion stays firmly in place. Inside this outdoor chair cushion is partially recycled polyester fill that helps it retain shape and provide long-lasting comfort during outdoor use. Although this Midback cushion is both water- and UV-resistant, we recommend bringing it indoors when it rains or when not in use to preserve its lifespan and keep it looking beautiful.