Luxuriously firm and supportive, the Serta Perfect Sleeper Hybrid Fall River combines the adaptive contoured support of premium memory foam material with the targeted deep down support of advanced innerspring technology. At the sleep surface, layers of Cool Twist gel memory foam, Serta PillowSoft foam and Serta Balanced Support foam work together to gently conform to your unique body shape, relieving pressure points and promoting airflow to provide superior comfort and support. Underneath the foam layers, premium coils hug the body as you move for custom support. And finally, the BestEdge foam encasement surrounds the mattress perimeter for superior edge support that extends the usable sleep surface while increasing durability and mattress life. 10 Year Non-prorated Warranty.