Mattresses Foundations Low Profile Foundation Solstice Sleep A High Quality 5 inch Foundation for when you want your bed to be lower in height. AKA box spring Finish Color Charcoal Gray Profile Height 5 Foundation Twin AFDAY47-5010 TWIN $89 Foundation TwinXL AFDAY47-5020 TWIN XL $95 Foundation Full AFDAY47-5030 FULL $100 Foundation Queen AFDAY47-5050 QUEEN $119 Foundation King AFDAY47-5020X2 KING PAIR $190 Foundation Cali King AFDAY47-5070X2 CALI KING PAIR $215