Polywood XPWS0021-5410 Seat Cushion in Air Blue 20" X 17" X 2.5"POLYWOOD® cushions are tailored specifically for each piece of our furniture. Sewn and crafted with Sunbrella® upholstery fabric, our fabrics provide comfort and durability all while withstanding nature's elements. Available in an array of colors and fabrics, the inner-designer in you will love the style options.