Size Selection Including 2 deep seat cushion: seat cushion 24" W x 24" L X 4" T, back pillow 24" W x 20" L. (Please measure the dimensions of your furniture s seating area before purchasing). These dimensions are a perfect fit for almost all outdoor chairs. Waterproof and Removable Cover Made of eco-friendly, sturdy polyester fabric with a waterproof coating, the cushion cover is UV-protected and fade-resistant, providing you with a comfortable outdoor experience. The removable cover features a covered YKK zipper for easy cleaning and replacement. High Resilience Foam The Unimatta chair cushions are filled with high-quality 100% foam, high-density sponge and 100% polyester fiber offers excellent support and long-lasing comfort.