This wedge pillow is made of furniture-graded base foam with a memory foam layer on top for maximum comfort and durability. Its unique profile allows your legs to elevate to a higher position to achieve "zero gravity" spinal alignment, which helps improve circulation and ease back pain, keeping your ankles and feet above heart level. For extra comfort, this version comes with a 400 thread count, 100% Egyptian cotton cover that feels silky-smooth and can be removed for easy cleaning.