Very sturdy, heavy duty frame.  My 16 year-old was able to assemble it herself. 
We recently moved, & the movers commented on how heavy it was, plus it was sturdy enough that they didn't have to take it apart to move it down a flight of stairs at the old house & then up a flight of stairs at the new house.  Bought with 8" Olsen Medium Memory Foam Mattress from Wayfair.com.