They have a 100% polypropylene cover and 100% polyester fiberfill interior. They work well for craft projects and needlepoint or knit pillows as they have a medium firmness and a flatter appearance. Soft, supportive and economically priced. Available in a variety of square sizes. 100% polypropylene cover and 100% polyester fiberfill interior. Medium firmness and a flatter appearance.Previously Item: CPW20Made of: 100% polypropylene cover and 100% polyester fiberfill interiorWashing/drying instructions: Machine wash on gentle with warm water. Air dry or tumble dry on air or low heat setting. Fiber may shift during laundering. Gently massage the project with fingertips to move the fiber back into place.Best use: Pillow Insert