A Murphy Be or Wallbed is a bed that flips up at the head end for storage inside a closet. To achieve this, the mattress is attached to the bed frame, often with a bolt at each corner. Murphy beds are used for space-saving purposes, much like a trundle bed is. Due to space limitations, most Murphy beds do not have box springs. Instead, the mattress usually lies on wire mesh. Most Murphy beds are also not equipped with headboards, footboards or bed rails.