Hi jaywood1.
Welcome to our Mattress Forum! 
Hopefully, you’ve read the Mattress Shopping Tutorial post which has all the basic information, steps, and guidelines that can help you make the best possible choices, learn how to avoid the worst ones.
I don’t know where you obtained the information you listed above but the layering and specs on their own site are very different then what you have.
They list in this order from top to bottom 3" Energex foam (density unknown) / 2" foam layer (density unknown) / 5" HD foam (density unknown)
If you manage to find the complete specs I’d be happy to comment upon the mattress that you are considering.
You are correct that Lucid does not provide any meaningful information about the specs contained within their mattress, but you may wish to do a quick search on our forum Search our forum with the key term “Lucid” which will bring up more comments about it. You may also wish to keep in mind that were a few issues with the covers that that were discussed In this thread here
The quality of the materials in the top 3" - 6" or so of a mattress will have the biggest effect on durability but durability will also depend on your weight and the other factors involved in the relative durability and useful life of a mattress (see post #4 here and the posts it links to).
In your research for a mattress, I’d make sure that you know the specifics of all the layers so you can identify any weak links and make sure that it uses the highest quality materials that are available in your budget range. The information you would need to identify any weak links and make meaningful comparisons between mattresses in terms of durability is in post #4 here. When assessing any product, also be sure that you find out information listed here so you can compare the quality of the materials and components to the durability guidelines here to make sure there are no lower quality materials or weak links in a mattress that would be a cause for concern relative to the durability and useful life of a mattress before making any purchase.
Hopefully, you can take some time to read through this information which will help to give you a good start in your mattress research.
Phoenix