en BUNKIE BOARD: saving budgets replacing beds, it eliminates discomfort from rigid steel & wooden frames and uncomfortable mattresses. The thickest bed board supports your mattress, preventing sagging and revitalizing its comfort. THICKEST FRAME DESIGN: The premium bunkie board made from the THICKEST of 10mm, engineered board. This thickest board under mattress support provides a straightforward yet highly effective solution to old sagging furniture at once. ULTIMATE MATTRESS PROTECTION: It is perfect for delicate foam and hybrid mattresses while high-quality materials ensure long-lasting durability and stable mattress support, preserving its shape over time. Bed Support Boards with Improved Sizes: The Large Queen-Size option measures 60 inches in width and 80 inches in length.