The mattresses are exactly as described and seem very comfy.  I have just battled with the enormous amount of polythene wrapping to get them out and put them on the bunk beds!  (It's worth noting that if you expose any of the mattress before the outer layers are removed, that bit will start expanding and will  make the job harder) .  They were scheduled for delivery on 4th December but when I woke this morning and opened curtains (about 8.30am), they were lying in the front garden!  This was only 2 days after I ordered them so excellent service but wish they had  knocked!  The emails warning me of their impending arrival appeared in my inbox overnight so I hadn't seen them!  Anyway, thank you once again Wayfair for a successful transaction.
PS.The bottom bunk, which is full size single bed, only just contains mattress for some reason, so sizing is generous.  Top is fine.