The Diamond Luxury Firm Mattress, by Symbol Mattress, gives you a quality, supportive mattress at a great value price. Individually wrapped, heavy duty coils, provide great support as they adjust to your curves. The Quantum Edge, denser coils around the outer edge, provide a sturdy sitting edge as well as providing full use of the mattress surface. Layers of comfort foam, including multiple layers of Gel Quilt for extra support and cooling, as well as High Density Memory Foam, for pressure relief and firmness. Enjoy this Luxurious Firm Mattress at a good value price.