But these bunk beds do much more than just give you a lot options. They are also built to be exactly as tough as you need them. The hardwood construction is designed to last, year after year. And the structures of the frames are further strengthened by reinforcing certain vital stress points with steel. No matter what you use your twin over futon bunkbed for, you are bound to find that both the frame and the variety of stains will meet both your design and durability needs.