"This outdoor seat cushion makes your favorite armchair even more inviting. Made from Sunbrella that's resistant to weather, water, UV rays, mildew, stains, and fading, this cushion features a square silhouette with two rounded corners that are made to fit snugly to the back of your chair. The 2.5” thick fiberfill insert features a zipper closure, making it easy to remove the covers. Best of all, it's easy to maintain – just spot-clean whenever it needs a refresh.