Hi walger,
I would encourage you to to a bit of research on the site and look in some different directions starting with post #1 here which will give you all the basic information, steps, and guidelines you will need to make a good mattress choice.
A mattress is only as good as the quality of the construction and materials that are inside it and the major brands and the chain stores that usually sell them don’t provide the information you will need to know the quality or value of any of their mattresses or make meaningful comparisons with other mattresses.
The so called mattress specs you linked doesn’t include any information about the quality of any of the materials in the mattress.
In the rare cases that you are able to find this information (if you are willing to put in the time, effort, and frustration of digging for this information usually to hit dead ends where it isn’t available anyway) … you will discover that they use lower quality materials and sell for higher prices than many other better quality/value smaller independent manufacturers that are either sold factory direct or through better sleep shops across the country.
Phoenix