Hi MatRest,
Unfortunately these specs are mostly meaningless because they don’t include the density of the foam layers (see this article)
Post #2 here has more about the two main strategies I would use (outside of selling the mattress and starting over again) if you are in the unfortunate position of needing to do a comfort exchange at a store where there are no particularly good quality/value options available.
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I would exclude any mattress that used memory foam that included more than “about an inch or so” of either unknown density or less than 4 lb density (if they disclose it).
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I would focus more on the thickness of any lower density or unknown density foam in the comfort layers than on the overall height of the mattress
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This is always a good idea.
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This is an even better idea although sometimes you won’t be able to find out no matter how hard you try. It will depend on the transparency of the manufacturer.
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I would focus more on the “value” of a mattress purchase than just on just the price of a mattress alone (see post #13 here).
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I guess this would be an option as well but it wouldn’t be my first choice
In general the mainstream mattresses are worse than 10 or 15 years ago yes (see post #3 here and post #404 here and post #12 here).
My “best” advice is always to follow all the steps in the tutorial one step at a time and of course your comments or any questions that you may have along the way are always welcome.
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Read the general information so you are familiar with some of the basic information about mattresses and can recognize the manufacturers and retailers that already know what you would otherwise need to learn.
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Learn what to avoid and decide on your budget and on the general types of mattresses and materials you are most interested in testing.
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Choose the stores or manufacturers that you plan to visit that are knowledgeable and transparent about the materials in their mattresses.
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Test mattresses carefully for PPP and suitability and check the quality of the materials for durability and narrow down your choice at each retailer or manufacturer you visit to one.
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Make a final choice between your finalists
Optional #6. Include online options to the local options you are considering in step #3 but in this case you would be replacing testing their mattresses with more detailed conversations on the phone. Also narrow down your choices here to a single mattress at each online retailer/manufacturer you are considering to include in your “finalists”.
Phoenix