The Won't Go Flat Pillow gives you support and cushioning comfort with its pillow-in-pillow design. With a durable foam core wrapped in an outer layer of springy, high loft fiber, you get lasting support that never goes flat. Super standard: 20-in. x 28-in. King: 20-in. x 36-in. 305-thread count Medium support for back sleepers Durable foam interior provides resilient head and neck support Springy, sprial spun fiber provides lasting, cushioning comfort 5-year warranty Imported Material & Care Cover: cotton; Fill: fiber Spot clean only