Bunkie boards are used to support the mattress when you do not want to use box springs or a box foundation because of the height. The bunkie boards are made with pine slats for support, corrugated board is placed on top to remove spacing, and then it is covered with organic cotton mattress ticking. These Bunkie boards are approximately 1 1/2" to 2 1/2" thick.
Due to the size of these, they must be shipped by a major freight carrier. Outside of the Southern California area, they are typically only cost-effective to ship when ordered with a mattress at the same time.