Some of the Sertapedic models also have Memory Foam, which adapts its shape to your body and sleeping positions. This feature helps to reduce the pressure points that cause tossing and turning. The StabL-Base double beam foundation of the Sertapedic provides consistent back support along the mattress' bottom. This construction promotes durability, and helps to isolate the movements of your sleep partner, so that you can go undisturbed by their tossing and turning. The VertiCoil Premier Innerspring of the Sertapedic provides 35% increased surface coverage (compared to the innerspring systems of mattress models in the same price range), which helps the mattress to react and conform to the shape of each individual's body. You have the option of adding the foam encasement to the VertiCoil Premier. The foam encasement will add to the strength of the mattress' edge, which helps to prevent you or your partner from rolling off. The Sertapedic mattress comes in all standard sizes: Twin, Twin XL, Full (sometimes called "Double"), Queen, King and Cal. King. There are model options available for the Serta Sertapedic mattress, ranging in price from about $300 to about $800. The Serta Sertapedic mattress has a limited warranty, the length of which depends on the model.