If you are looking for a firm mattress without compromising comfort, 
you can't go wrong with this choice

Quilted with high quality fabrics, cigarette fire-retardant, sanitized anti-fungi, anti-mold, anti-bacteria and anti-acarian (anti-bugs) treated. Coil heat treated for rust proofing and certified ISO9002. Steel frame of high tensile carbon reinforcing stability of the metal box.  Foam reinforcements in the middle of the metal box.  Upholstery filling made of layers of resilient foam polypropylene. Four self cloth horizontal handles with aero-valves. Turning label.