Abstract: A ventilated adjustable firmness bed designed to allow a user to manually change the firmness of their bed. A ventilated adjustable firmness bed includes a multilayered mattress and a uniform mattress, wherein the multilayered mattress and uniform mattress each have a different firmness. A cover is designed to enclose both the multilayered mattress and the uniform mattress, with a fastener designed to secure the multilayered mattress and the uniform mattress within the cover. The multilayered mattress has a plurality of apertures designed to provide ventilation and has one or more layers, each of a different firmness and extending the full width and length of the multilayered mattress such that each layer is flush against one another. The uniform mattress has a plurality of slots along an upper surface. In this way, a user is able to manually adjust the firmness of the bed through vertical alignment of the mattresses.