Cool, Comfortable, and Supportive Rest. Add support and spinal alignment to the surface of any mattress with the ErgoAlign Mattress Topper. This innovative 3 inch mattress topper is ideal for those with frequent lower back pain because it features a segment of ultra-dense foam beneath your midsection to provide additional support and pressure relief where you need it. We've chosen the highest quality materials and assembled them all in our Arizona factory to ensure you enjoy a premium, durable feel.