> Bottom berth is actually more comfortable, but we perefer the top due to the
> softer sides giving the illusion of a wider bed.
>
> Karl Wolz

top actually is wider.  I measured both once, forget both the measurements and why I did it now.  I also laid the mattresses down one on the other to compare when I took the covers off to wash them.  BTW, when you wash the covers, take care not to use even warm water, as the rayon (visqueen) will shrink.  I used cold water, but even so, they were a much tighter fit on the foam pieces after air drying than when I took them off.  Putting them back on was a fight.  Stretched out now, and ok.  DMc