★This bed is "customer assembled furniture"★ For "customer-assembled furniture," we ask that customers unpack, assemble, and install the product themselves. Designer bunk bed with urethane mattress ■Breathable slatted design The mattress is made of slats, which improves the breathability of your mattress or futon. The surface material is also wide and sturdy. The floorboards are made of slats, which allows air to flow through, allowing moisture to escape and providing excellent ventilation. We use high-strength laminated board slats. The underside of the slats is fitted with a dust guard to prevent dust from getting on the person sleeping on the lower bunk when the upper bunk shakes. It protects the person on the lower bunk from dust so that they can stay comfortable.