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 Plush 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. Plush Mattress Plush mattresses offer a softer more comfortable give to your sleeping surface. They are definitely the ideal choice for the softer mattress lover. If you are a back or side sleeper, then you will enjoy a plush mattress. If you sleep on your stomach, a plush mattress will not keep your spine in alignment as well as a firmer option would. A plush mattress is going to offer you more of a ‘give’ feeling and allow you to have a sinking feeling when you lay on the 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.