InteVision Ortho Bed Wedge Pillow with a 400 Thread Count, 100% Egyptian Cotton Cover (8" x 21" x 24")Two layer design: it is made of memory foam layer on top of a firm base foam for better comfort. Although it is more expensive to manufacture such a product, it does give the benefits of letting you experience a more comfortable, soft feel of the cushion while the firm base foam providing the support you need. Helps improve circulation (Size: 8" x 21" x 24") Allow the spinal cord to relax, helping relieving back pain High quality, 400 thread count,