This Luminous Sleep Medium Firm mattress set by Serta Perfect Sleeper features a CoolFeel™ Fabric for a cool-to-the-touch sensation from technology that is plant-derived, a layer of HexCloud™ Gel memory Foam to deliver cool, contouring pressure, relief for a oh-so-relaxing-sleep, WonderCloud™ Memory Foam that cradles your body for the ultimate comfort experience, BubbleCloud™ Memory Foam to deliver the cushioning support you need to feel energized when you wake up the next morning, and the Serta BestEdge® Foam encasement technology to help reduce edge roll-off and extend the sleep surface, and the Custom Support Coil System to deliver unparalleled support and less motion transfer.