Simmons BeautySleep Edgemere King Firm Mattress Set Our luxurious stretch knit fabric is comfortable and soft to the touch The circular knit design adds a gentle touch to this resilient fabric, which provides a luxurious touch for a more comfortable night's sleep 575 Coils in our High Performance Coil System helps to provide the same durability that is traditionally associated with the Simmons BeautySleep brand CertiPUR-US comes with Comfort and Confidence The flexible polyurethane foam in this product has been independently laboratory tested and certified to meet voluntary standards for content, emission and durability Foam encased edge support system helps provide a supportive seating edge and maximizes the mattresses sleeping surface