I suggest you avoid Foster and Stearns, or Stearns and Foster. Mine was expensive but after five months of use, the side where I'd get in bed was getting "broken down? "and also the mattress had a noticeable sag of about five inches where I sleep. The 10 year warranty was apparently for some other mattress or somebody else. I'd hoped the ratings and price were indicative of longevity. Rotating it end for end helped, but ,Dang, that suckers heavy. I'm following this thread with interest.

I'm not cheap, I'm frugal.
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