This BUNKIE BOARD adds extra bed support under the mattress to help prevent sagging, extending the life of your mattress. Designed as a low-profile bed board, it's a smart choice over bulky box springs or mattress bases. The BED BOARD FOR UNDER MATTRESS SUPPORT offers firm, even support without the added height of a traditional box spring. Featuring a foldable and lightweight design, this BACKBOARD FOR BED is easy to store and ideal for folding beds, futon mattresses, foldable bed frames, or travel cots. Flat bed frame, foldable bed frame, folding bed frame, low-profile bed board, good mattress base, mattress support bed, bed slats, bunkie board, box spring, thin board, thin box spring, bed box spring, The UNDER-MATTRESS SUPPORT BED BOARD is perfect for kid's beds, bunk beds, sofa beds, pull-out beds, and cardboard bed frames with no box spring needed—compatible with metal frames, wood slats, and standard bed slat foundations. As a thin box spring alternative, it is intended to fit beneath the centre of the mattress for added support without covering the entire base.