p style="margin: 0px; text-align: justify;">Each SleepSafe Bed needs some type of foundation for the mattress to rest upon. In a bed with the Fixed foundation, you have a choice between a box spring or Bunkie board for your mattress to lie upon. The difference is in the height, a bunkie board is 2 inches high and a box spring is 8 inches high. When you want to maximize the safety rail height above the mattress you should choose a bunkie board so that the mattress surface can be positioned 6 inches lower within the bed’s foundation. In order to raise the mattress surface as far from the floor as possible you should choose a box spring so that the mattress will be positioned 6 inches higher. There is no price or comfort difference, only a height difference.</p