Hi hologramaja,
You may have purchased your mattress a little earlier because Heilig Meyers was closed in 2001 due to a bankruptcy but I checked their old website and did some searching and I wasn’t able to find any meaningful information about their mattresses. If it was a pillowtop it would most likely have been some type of innerspring with polyfoam and fiber in the pillowtop. Even if you knew more details of the layers and components though you still wouldn’t be able to duplicate it anyway if that’s the reason you wanted to know what was inside it.
They also don’t provide any meaningful information about their mattress and I would want to know the density of the memory foam and the polyfoam in the mattress (see this article).
They also mention that they are “built to USA standards” which most often means that they are a Chinese import (see post #6 here) and if that’s the case I would also want to know that they were CertiPUR certified.
As far as donations to a charity this is often more about marketing than anything else. They don’t say how much they are donating (just a “portion”) and their donations could also be the result of donating their returned mattresses to the charity they are supporting (National Alliance to End Homelessness). Either way their donations and returns would be built into the price of the mattress. I would personally prefer to choose my own donations to causes I believe in than buy a mattress where the donation was included in the price unless I knew how much of the price was a donation and I wanted to support that particular charity.
I also noticed that their customers are required to keep their mattress for 50 days before being allowed to return them which IMO is a little bit on the long side if a mattress you purchase doesn’t turn out to be a good “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences).
How did you happen to find them (I’m curious because they don’t turn up on most google searches)? I’m guessing it was on Amazon?
Their Amazon reviews don’t include any verified purchases and appear to be “planted”.
Overall they appear to be a “basic” memory foam mattress similar to many other cheap Chinese imports and if it was me I would want much more information about them and their company before considering them as a realistic option.
Phoenix