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. 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.