Mattresses Foundations Standard Foundation A High Quality 9 inch Foundation for your mattress. Finish Color Charcoal Gray Profile Height 9 Foundation Twin AFDAY46-5010 TWIN $63.00 Foundation TwinXL AFDAY46-5020 TWIN XL $71.00 Foundation Full AFDAY46-5030 FULL $75.00 Foundation Queen AFDAY46-5050 QUEEN $82.00 Foundation King AFDAY46-5020X2 KING PAIR $142.00 Foundation Cali King AFDAY46-5070X2 CALI KING PAIR $154.00