Old mattresses had a heavy border wire that went around the perimeter of the mattress...top and bottom.
Today's mattresses don't have that anymore, so that they can be used on an adjustrable bed base.
It was that border wire that, once bent, became a problem.
The coils inside the mattress have a great deal of flexibility to them.
The foundation for the Wolf Brooklyn mattress, comes KD and is very easy to assemble....needing no tools.
I'm sure you already have it, but here is the link.
Buy a mattress that will last as long as the warranty advertises. Buy a therapedic double sided, flippable mattress from The Mattress Expert Today!
Delivery is free and there's no sales tax. You can order that on-line...or, by phone if you prefer.
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Free Delivery Nationwide....US & Canada...NO SALES TAX.