1, Flat to flat riveted which is less noise and long cycles of test. 

2,Reduce the height differences between head tube and foot tube for health sleeping. 

3,Reduce the discomfort to the body because shoulder bar is awy from shoulder. 

4,Cross wires cover much more space for less sagging during the sleeping. 

5,Anti-tilt system is riveted to avoid drop off issue for safety reason. 

6,Angle rails system can lock the mattress inside firmly for seat comfort.

7,Offer air breath deck and high leg version. 

That's why we strongly recommend you to convert overnight sleeper 2500# to DF00# series.