Vevor Bunkie Board Cal King Foldable Bed Board 72.4" x 83.8" NewThis foldable bunkie board creates a stable, flat base for your mattress to help reduce sagging and improve support. It features high strength PP panels with an Oxford fabric covering for durability and quieter contact with the bed frame. The slim 0. 4" profile fits between the mattress and frame without adding noticeable height. Hook and loop straps and a non slip base help keep the board securely in place. It also folds for compact storage when not