Outdoor 4'' Cushion (Set of 4)The outdoor seat back chair cushion is made of 100% recycled polyester made from plastic bottles, environmentally friendly. Attached ties can keep the patio cushions stay firmed when sitting on the patio chairs. It gives you an elegant, good feeling, comfortable, and leisurely lifestyle, best for use in the sunroom, screened room, front porch, and backyard. Hashing its string, the cushion is replaceable. The cushion size is 20x20x4 inches. Spot clean