Unfold this 1/4" thick bedboard and slide it between your old, saggy mattress and box spring -- your lower back will thank you! This folding mattress support is better than a sheet of rough, heavy plywood, because you can fold it to 30"x15" for easy storage, and it won't ruin your bedding. The Folding Bedboard is made of vinyl over thin wood board, not cardboard like many competitors. Unfolded, it's 30"x60" for a twin bed; get two for a queen size bed.Preparing for holiday guests can be a stressful time. See how we used the Folding Bedboard along with several other furniture pieces to maximize your guest room in our Preparing for Holiday Guests article.