what size pillow insert for 18x18 cover

To achieve a full and plump look for an 18x18 pillow cover, it is recommended to use an insert that is 2 inches larger, making the ideal insert size 20x20 inches. This will ensure that the pillow is filled out fully and looks luxuriously plump. However, for smaller pillows and most lumbars, it is best to use an insert that is only 1 inch larger than the cover to prevent overstuffing. It is important to note that the size of the insert may vary depending on the fill material. For example, down feather inserts look best with a pillow cover one size smaller than the pillow insert for a full look, while polyester inserts require a pillow cover that is 2 to 4 inches smaller than the insert.