Package contents: 4 pieces total -- two seat cushion covers and two fillings. The seat cushion sponge and cover measure 19 x 19 x 3 inches; the backrest pillow insert and cover measure 19 x 17 inches. Use the included installation guide to assemble. Measure your seat cushion size carefully before ordering. Double-side waterproof and stain-resistant: outdoor cushion set is made from premium waterproof materials that resist rain and spills. The stain-resistant fabric is easy to clean, helping you maintain a neat appearance with minimal effort. High-density foam filling: cushion core uses high-density foam that keeps its shape and offers steady support. It remains comfortable and resilient after extended use, suitable for long outdoor gatherings. Durable and UV-resistant materials: constructed from polyester fabric that resists fading under sun exposure, keeping colors vibrant over time. Use scenarios: ideal for patio dining chairs, poolside or deck lounging, and balcony seating during outdoor gatherings.