The Bunkie Board is a low-profile foundation accessory designed to create a flat, supportive surface under a mattress. It is commonly used when a bed frame, platform, bunk bed, or slatted base needs additional support for foam, latex, or hybrid mattresses. Construction and materials Thin support board format. Designed to sit below the mattress and above the frame or slats. Provides a flatter sleep surface than widely spaced or flexible slats alone. Construction details and size options depend on current product configuration. Compatibility and fit Choose the size that matches the mattress and bed frame. Use when the mattress requires even support or when the frame's slat spacing is too wide. Confirm compatibility with mattress warranty requirements before use. Setup and care notes Place flat on the bed frame or slatted base before adding the mattress. Make sure the board is supported evenly and does not bow. Keep the support surface dry and clean. Replace if damaged, warped, or no longer flat. Shipping, trial, and warranty details Current shipping, return, and warranty terms should be confirmed on the live product page and Nest Bedding policy pages. Best uses Supporting mattresses on platform beds, bunk beds, trundles, and slatted frames. Adding a flat surface without raising the bed as much as a box spring. Helping preserve mattress feel and support over time.