24" X 24" Choice White Pillow Insert 24" X 24" Choice White Pillow Insert Pillow Inserts are the easiest way to make your pillows look full and new. This 24" x 24" Choice White Pillow Insert is a great way to fill out your favorite decorative pillow covers to accent your room. This super soft white square pillow insert is made of high quality polyester and is double-stitched for durability. Designed to stay fluffy, soft, and full, this insert will be a great companion to your decorative cover. 24" x 24" x 5".