Weathercraft Designers Choice Sunbrella Adirondack Chair Cushion Seat cushion: 20W x 20.5D x 1.5H inches Back cushion: 15.5W (bottom), 20W (top) x 30L x 1.5H inches Sunbrella fabric is the best for outdoor use 5-year fade-resistant warranty Acrylic fiber is rot-, UV-, mildew-resistant