Simmons King Size Beautyrest Black Rita Extra Firm Tight Top Mattress Set includes both mattress and white box-spring Mattress layers: quilting - consists of cashmere woven in the cover - regulates sleeping temperature; 2 Geltouch layers for unparalleled comfort Cover: double-knit to provide a soft texture; Euro Cool foam to enhance breathability and airflow Edge design: ventilated encasement of AirCool Beauty-Edge foam Dimensions: mattress measures 76" W x 80" L x 13" H