The Sealy® Crown Jewel mattress collection utilizes many variations of foam. StableEdge creates a reinforced center that supports the heaviest part of your body. Multiple layers of foam are included to develop extreme comfort for you throughout the night. The result of all these layers is quality and comfort that you are accustomed to finding from Sealy, while still maintaining a price you can afford. Sealy® CoreSupport Center The Sealy® Crown Jewel Performance Cushion Firm Black Opal mattress features zoned support. Zoned support is going to ensure that you will get the support in the heaviest parts of your body. The center of the mattress is reinforced. This will help with keeping your spine in proper alignment and more comfortable night of sleep. Cushion Firm Mattress A cushion firm mattress usually has a little bit of give, but still provides a harder sleeping surface on the mattress. If you tend to wake up with back pain on a softer mattress, a cushion firm mattress may be the ideal choice for you. A cushion firm mattress feature one inch or less of sink-age or hug. A cushion firm mattress is designed to essentially float the sleeper on top of the surface of the mattress. A small amount of give may develop over time, but never to the point of a plush mattress. StableEdge System The StableEdge system on the Sealy® Crown Jewel collection gives you a maximum amount of sleeping surface. A lesser mattress may have an edge that bends when you sit on it, essentially causing you to slide off. The reinforced edge constructed by Sealy, allows you to put weight on the edge without the mattress completely losing support. The mattress features two rows of Quantum Edge Coils to provide edge to edge support. The StableEdge lets you take advantage of your entire mattress, not just the middle.