★This bed is "customer assembled furniture"★ For "customer-assembled furniture," we ask that customers unpack, assemble, and install the product themselves. France Bed Multi-Las Super Spring Mattress Included Folding bed, semi-single, excellent breathability, shelf, outlet included, France Bed, multi-layer super spring mattress included, vertical opening, semi-single, regular depth It is said that the dust is most likely to be floating about 30cm above the floor in a quiet bedroom. This is the height of your face when you lay your futon on the floor. In other words, when you sleep, you are breathing at the height where there is the most dust. Inhaling a lot of dust every day can cause allergies. "Prostor" is 34-48cm above the floor. You sleep on it, so you can sleep in clean air with less dust.