Pillowflex Pillow Form Insert, 16 by 16-Inch 16 Inch by 16 Inch Square Pillow Insert.(With the pillow just laying there the measurements are 13 x 13, but by pulling the corners flat it extends out to 16 x 16) High Loft/Machine Washable/Odorless/Hypoallergenic Slick lump resistant fiber Please see sizing chart in the product desription for selecting the correct size pillow insert Made in Palmetto, GA USA