The pillowcase is made from a blend of polyester and cotton, commonly known as polycotton. This blend offers the benefits of both materials, including the softness and breathability of cotton and the durability. The U pillowcase is specifically designed to fit U-shaped body pillows that are 9 feet long and 12 feet long. These sizes ensure that they completely cover and protect your U-shaped pillow. It typically features a Flap closure, making it easy to insert and remove the pillow for washing and maintenance.