Helically suspended poly deck. Sturdy construction, designed for maximum durability. Angled up side rails help restrain mattress. Dual gravity locking mechanism. Torsion "spring loaded" activation bar assures that the bar is alwasy in the locked position. Rounded corners. Use this bed under any of our twin beds (not headboard only versions...sorry). On the Jane twin bed, it is completely hidden by the bedskirt, and on the Dick twin bed, we provide a face plate for a more tailored look.