Hi C10CoryM,
You won’t be able to find the specs because Simmons or the retailers that sell them don’t normally disclose them. Like all the other major brands … they tend to use lower quality and less durable foams in the comfort layers and I would just avoid them all completely (see #1 and #2 in the guidelines I linked in my previous reply).
There is no reason to avoid all innerspring mattresses for the sake of durability though since an innerspring is not normally the weak link of a mattress. The materials above the innerspring support core are almost always the weak link of a mattress and any lower quality/durability layers above an innerspring are the reason that they develop soft spots or impressions … not the springs themselves. This is why it’s always so important to make sure you know the quality of all the materials in any mattress you are considering and avoid any mattress where the quality of the materials is either too low or you can’t find out (which almost always means low quality materials). A good innerspring mattress with high quality layers above the spring can be a very durable choice.
The better options or possibilities I’m aware of in your area (always subject to the value guidelines I linked earlier) are listed in post #2 here.
Phoenix