Hi CatAndGirl,
If I am to understand your question, you tried a EOS naturepedic in the store, and liked it, but they could not split the comfort layer on a display model in the store for you to test.
Yes they give you new layers. All replacement comfort layers are brand new, not refurbished or cleaned returns. They take the used ones back (when applicable for comfort exchanges), but you always receive a new component.
Naturepedic uses a full encasement pillowtop zip system, so while the comfort layers inside are split (e.g., left side firm/medium, right side medium/medium), they’re still contained within a single, unified quilted pillowtop. Most solo sleepers don’t feel the split, especially if, the comfort layers are the same on both sides, or you sleep centrally rather than right on the split seam.
However, I have read that some very sensitive sleepers report feeling a “ridge” where the comfort layers meet, especially when lying right on the line and if there’s a noticeable difference in firmness between the two sides.
If you’re going firm/medium and medium/medium, the difference is subtle enough that most people report the seam “disappears” after the first few weeks of break-in.
Store models are broken in, pretty much anywhere you go, with just about any mattress, likely 6 months+ of people testing them. They’ll feel softer than a new one. Unless it is a new model or a redesigned model.
Latex, especially organic Dunlop (which Naturepedic uses), does break in a bit, but not as much as synthetic foam or Talalay latex.
If you liked firm/firm/medium in the store, it’s safe to expect the at-home version to feel noticeably firmer at first. If you plan to increase side sleeping (which puts more pressure on your shoulder and hips), the medium/medium combo might serve you better long-term, but if it doesnt work, you always have the option to replace a layer at anytime.
@TheCleanBedroom is well versed with Naturepedic and may offer some additional wisdom.
As for alternatives. @Sleep_EZ or @Arizona_Premium could easily come up with a solution for you in this area.
@DLX offers the latexlux, and has a hybrid with split comfort layers in both queen and king, but offers a different configuration method. The DLX is one that you would find it extremely difficult to notice the split, as their zipper cover offers 1-1/2" of 1.8lb density foam so feeling that very tightly set in the mattress. My mother in law has the premier hybrid version in a queen firm/med split and you would never know it was a split internal comfort layer,
If you do consider a DIY, then you really need to consult with @Sleep_EZ or @Arizona_Premium, they may call it do it yourself, but it is not something you would want to tackle without professional help.
Hope this helps,
Maverick