Achieve cool and supportive 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. Our support foam helps relieve pressure points and tension while our upgraded innerspring system provides long-lasting support. This Serta Perfect Sleeper has a medium feel that is ideal for all types of sleepers. At the top of our 12" mattress, we have our cooling mattress cover that promotes cool airflow and prevents heat buildup. Both of our cooling gel memory foam and cooling gel foam work together to make sure you stay cool all night long. Sleep cool tonight on our hybrid mattress. | Serta Perfect Sleeper Dazzling Night Hybrid King Mattress - Medium