Hi broken1812,
There is a lot of information here but the first place I would start is the tutorial post here which has all the most important information, steps, and guidelines that can help you make the best possible choices ⦠and know how and why to avoid the worst ones.
Post #4 here was also from a member that was trying to āconvinceā their other half about the same things and the links I included in my reply would also be well worth reading.
No ⦠they have many factories across the country and internationally.
The major manufacturers make hundreds of different mattresses so itās not always possible to generalize about all of their mattresses (outside of suggesting to avoid them completely) but lack of transparency and/or lower quality materials and/or poor value relative to other similar mattresses can all be issues depending on the specific mattress. Itās normally very difficult to find out meaningful information about the materials they use (lack of transparency). If you are successful in finding out (which often requires some very time consuming research or āinside informationā) then you will normally find that in most cases they use lower quality materials in their comfort layers which is the main reason you see so many complaints about soft spots or impressions in their mattresses. In those cases where you are able to verify the use of higher quality materials they are generally priced much higher than many of the smaller local or regional manufacturers.
Even on the forum here there have been many cases of higher end Stearns & Foster mattresses developing soft spots or impressions in about 3 - 5 years (or sometimes sooner) that arenāt covered by their warranty (as you can see in post #174 here ⦠only visible impressions that are deeper than the warranty exclusions are covered by mattress warranties). The reason for this is almost always the use of lower quality/density foams in the comfort layers of their mattresses.
The only site I know that lists all the specifics of the major brand mattresses they carry is Jordans here and if you look at the materials inside the major brand mattresses they carry and compare them to the guidelines here you will see many specific examples of the use of low quality/density materials in the Sealy and Simmons mattresses that they carry ⦠even in the higher end. This would be typical of their similar mattresses that are sold around the country (itās not just the versions that Jordans carries in other words).
It would depend on the specific mattress you are looking at but in most cases the quality of the materials in the comfort layers (which are usually the weak link of a mattress) would be lower and I would avoid them based on the quality/density of the materials alone.
Phoenix