PolyesterPACKAGE INCLUDES: Set of 4 pillow covers, No Insert or Filler.Pattern is only on the front and no printing on the back.SIZE & MATERIAL: This pillow cover fits 18x18 inch insert, PLEASE NOTE: All of our pillow covers are made to ensure a snug fit. Each listing size refers to the pillow insert size and not the pillow cover size. To ensure the proper fit, we make all pillow covers slightly smaller (approximately) 0.5" smaller) than the insert size. Made of 100% Polyester, soft and skin-friendly, no fading or abrasion, can be used outdoors. This pillow covers has an invisible zipper. Machine wash in cold water The pattern has only one side, perfect item for home or sofa decor, It is a cute gift for your family and friends pillows/fillers into this pillow covers.WASHING TIPS: Machine wash in cold water separately, gently cycle only, dot not bleach.