This 12" thick mattress has a tight top and low-motion transfer, so it's designed to let you stay asleep, even if your partner tosses and turns. Three layers of memory foam and innersprings have a high firmness with a breathable, moisture-wicking design that helps keep you cool. It also features edge support to ensure you can sleep on any spot without the mattress sagging, and it includes a polyester cover to retain mattress freshness. Compatible with an adjustable base (frame and box spring sold separately), it arrives at your doorstep packed in a box, ready for you to set up.