King Serta iComfort Prodigy Everfeel Mattress Fiber Knit Fabric Imported Fire-resistant Fireblocker fiber and knit fabric are designed to conform to your body and maximize breathability, while 2" EverCool memory foam, 1" PillowSoft foam, .75" EverFeel foam, 1.5" Cool Action Dual Effects gel memory foam and 1" Cool Action gel memory foam upholstery layers provide exceptional comfort and pressure relief that will help you achieve a deeper, more rejuvenating sleep ComfortLast foam core helps support your body throughout the night EverCool memory foam features an open-cell structure that's designed to dissipate heat away from the body and relieve pressure while also gently conforming to your body for a soft yet supportive feel PillowSoft foam gently contours to your body for enhanced cushioning at the sleep surface Innovative EverFeel foam adapts immediately to your body's shape and temperature for a difference you'll feel from the moment you lie down