Innerspace Sofa Sleeper Mattress Replacement - 4.5 inch High Density Polyurethane Foam Comes with manufacturer's 30-day no-obligation sleep test.SOFA NOT INCLUDED, MATTRESS ONLY Finally a solution to the uncomfortable sofa bed mattress! Ships rolled via UPS. Expands to 90% in 30 minutes and to 100% within 48 hours. 4.5 High Density Polyurethane Foam-Quilted stretch-knit zipper removable cover No motion transfer between sleeping partners -Built-in FlameWatch flame retardant technology Manufacturer's 30-day no-obligation sleep test-Manufacturer's 10-year pro-rated warranty