"The Toss Pillow Insert 18X18 Square is the perfect filler for all your favorite square shams. This throw pillow insert is 18""x18"" which is the perfect size for a slightly smaller sham (17""x17"" sham is ideal), so the insert properly fills the corners for a filled out look and comfortable feel. This 18x18 pillow insert has a quality polyester cover and a soft polyester fill. Fabric and fill: 100percent polyester. Gender: unisex."