This pillow insert pairs with any appropriately sized cover, offering extra padding as you sit and relax. It's made from polyester, and it has a rectangular silhouette designed to provide lumbar support. Simple and streamlined, this pillow insert is the best way to make your pillow look full and new. When it requires a refresh, we recommend getting it professionally cleaned. Bonus? It comes in a wide range of sizes to suit your pillow cover of choice (sold separately).