Walker Edison Twin over Futon Bunk Bed Expand the space in your bedroom with this twin-over-futon metal bunk bed. This frame hoists a standard twin-sized mattress over a futon that unfolds to a standard full/double-sized mattress. Our Twin over Twin Stairway Bunk Bed with Under Bed Drawers is carefully crafted for timeless style and lasting comfort. Expertly constructed of solid wood, the bed measures 70″ high x 104″ long x 44.5″ wide. .