Get cool, support sleep with the Serta Perfect Dazzling Night Hybrid Mattress. Our king size Serta Perfect Sleeper mattress utilizes a smooth top and an 850-coil density system that delivers zoned comfort, cooling, and pressure relief. This Serta Perfect Sleeper has a firm feel that is ideal for front sleepers and back sleepers. At the top of our 12" mattress, we have our cooling mattress cover that promotes breathability and prevents heat buildup. Our support foam helps relieve pressure points and tension while our upgraded innerspring system provides long-lasting support. Our cooling gel memory foam and cooling gel foam work together to deliver cooling action all night long. Browse our hybrid mattresses today. | Serta Perfect Sleeper Dazzling Night Hybrid King Mattress - Firm