Hi shangkan,
That’s frustrating and if they are usually closed before 7:00 PM on fridays they should change the hours that are listed on their site here.
ADMIN NOTE:Removed 404 page link | Archived Footprint: ergocomfort.com/contact.html]site here
I would always keep in mind that the first “rule” of mattress shopping is to remember that you are the only one that can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved that are unique to each person to use a formula or for anyone to be able to predict or make a specific suggestion or recommendation about which mattress or combination of materials and components or which type of mattress would be the best “match” for you in terms of “comfort” or PPP or how a mattress will “feel” to you or compare to another mattress based on specs (either yours or a mattress) or “theory at a distance” that can possibly be more accurate than your own careful testing (hopefully using the testing guidelines in step 4 of the tutorial) or your own personal sleeping experience (see mattress firmness/comfort levels in post #2 here).
Whether a slight difference in firmness in the bottom layer would make a difference would depend on the person. Some people would notice a difference and some people wouldn’t notice much or even any difference at all depending on their sensitivity and body weight. Again … the only way to know whether it would make a difference for any particular person would be based on their own careful testing or actual sleeping experience. Differences in layers that are closer to the sleeping surface will tend to be more noticeable than differences in deeper layers.
There is also more about the pros and cons of a single 6" latex core vs two separate 3" layers in post #2 here.
“Feel” is very subjective so it will really depend on the person and who you ask. There is more about the differences between 100% natural Talalay and blended Talalay in post #2 here. Assuming that they are both the same ILD and firmness level … many people wouldn’t notice a difference but again there are a few people that will.
There is more about the pros and cons of a side to side “split firmness” mattress in post #2 here.
Phoenix