Sleepys is here to put a little perspective back into the world of sleep. The new Sleepys Slumber 12 firm mattress offers an exclusive design utilizing five zones of encased coils that provide the ultimate support and comfort for your whole body. The layers of HD quilt foam and soft quilt foam work in combination with a cooling gel-infused memory foam that not only provide superior pressure relief but also dissipates body heat. Underneath, there are five zones of encased coils that are uniquely structured to target different areas of your body. The sides are encased by an ultra-wide foam rail that supports the top layers of your mattress, so it wont sag or settle, no matter how you sleep.Dimensions: Twin: 39 W x 75 D Twin XL: 39 W x 80 D Full: 54 W x 75 D Full XL: 54 W x 80 D Queen: 60 W x 80 D King: 76 W x 80 D Cal King: 72 W x 84 D.Sherwood Warranty.Comfort Level: 2.