Our hollow fiber 12ft U pillow and pillowcase helps to reduce the stress and pressure placed on the shoulders, back, hips and knees created when they aren't supported. With thick and fine fabric, it is comfortable and breathable, and keeps you warm, allowing you to deeply enjoy sleep and health. Safe and odor-free, durable and non-deformation, soft and breathable, natural and environmental protection. The U pillowcase is specifically designed to fit U-shaped body pillows that are 9 feet long. 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.These sizes ensure that they completely cover and protect your U-shaped pillow.