“The firmness of the mattress will determine the level of comfort you need, and choosing a mattress with the right spring gauge is critical to that selection. Some bedding experts claim that 12.5-gauge springs offer the most firmness and longer operational life, hence their regular usage in orthopedic mattresses. A mattress with 13.5-gauge springs allows for more range of movement, but in the case of bunk beds, safety is important when you envision the danger of accidentally hitting your head on the top bunk frame.
Established Los Angeles mattress stores like Glendale Mattress Central are well-stocked with a variety of spring-based mattresses that will be perfect for your bunk bed. Mattresses with inner springs wrapped in individual memory foam linings are capable of handling the pressure on top of them; they are usually available for small- and medium-size bunks. “