No, a Sleep Number bed does not necessarily require a specific foundation. What side of mattress foam goes up slit or smooth? The smooth side of mattress foam typically goes up. Are there extensions for Buy Derila Online a king mattress on a California king frame in order to fill up the 3 inch difference? No, there are no standard extensions designed specifically to make a king mattress fit a California king frame. Does blue cross blue shield cover temper-pedicure mattresses? Is there a queen size single bed size? No, a queen size bed is not a single bed