Posturepedic Cushion Firm Innerspring Mattress by Sealy Sealy Posturepedic. Sealy Posturepedic Cushion Firm mattresses feature the Posturepedic Core Support Center which provides additional support where you need it most. The SitRight Edge System is designed to provide a solid seating edge and optimal flexibility. A rubberized foundation cover holds sheets in place and stops the mattress from shiftingFeaturesMattress height 12.2534736 coil count based on Queen sizeSitRight Edge System provides superior edge support10 yr warrantyAdditional Info and SizingStandard Box Spring Height8 934Low Profile Box Spring Height4 534Twin3934 x 7534Twin XL3934 x 8034Full5434 x 7534Queen6034 x 8034King7634 x 8034Cal King7234 x 8434Please refer to the Specifications to determine what items are included since sometimes the image shows more or less items. If you are not sure, please contact us and our customer service will be glad to help.