Hi Jewels,
Just to rearrange your specs a bit and fill in a few of the gaps … from top to bottom …
2" of soft 1.5 lb polyfoam: This is “on the edge” in terms of the thickness (see the guidelines I use here) and it would also help to know if this is in the pillowtop itself or if this is quilted to the top panel (quilting would make it a little more durable).
2" of latex: While this would be a good quality material … I would want to know the type and blend of the latex for reference.
1" 2.4 lb density polyfoam: This is a good quality material.
3 lb visco lumbar support: This is a lower density memory foam “belly band” but it’s deeper in the mattress and is there for lumbar support so it should be fine.
Insulator with full coverage flexible net with 2oz textile fiber pad: This is to even out the support of the springs and prevent the foam from sinking in to the coils. This should also be fine.
14.5 gauge, 644 coil count continuous coil with steel edge support: Continuous coils are fairly inexpensive coils but can be very supportive because of how they are interconnected and since the weak link of a mattress is rarely in the support system it should be fine as well.
The thickness of the continuous coil is missing so I can’t add up the thickness of all the layers to make sure that it matches the height of the mattress (which also isn’t mentioned) and confirm that all the layers and components have been listed.
So I would want to know that this was all the layers in the mattress and that there isn’t any additional layers (such as any quilting foam) which aren’t mentioned along with wanting to know the type and blend of the latex.
If this is all of the layers then there is a little more lower density polyfoam than I would be completely comfortable with and this could become a weak link in the mattress so it’s “on the edge” but it’s also “not too bad”.
Phoenix