The outdoor deep seat cushion comes to 1 set of 2-piece, SEAT plus back, composed by cover plus foam individually. The cushion foam is thick and elastic, made of 100% polypropylene. Rebound quickly, the cushion returns to the original shape after every use, can give you the extremely comfortable feeling. Cover is in used of YARD-DYED fabric. It's UV treated and water repellent. A non-slip fabric is used to the SEAT cover in addition. There's a long-zipper on the cover, is convenient for you to remove it easily and have it washed. SEAT size is 24 in. x 24 in. x 6 in., back is 18 in. x 24 in. x 6 in. They are the best to use for both outdoor and indoor furniture, especially the perfect match to your chair or sofa used in patio, sunroom, screened room, front porch and backyard, will definitely make you feel relaxed and comfortable.