Hi dzignr_tastz,
One of the challenges of some “made in the USA” claims is that the mattress may be assembled in the USA but the materials are imported from elsewhere. It’s certainly possible that foam buns are being imported from China that are being slit and assembled into a mattress in the US. SilverRest is also a licensee for King Koil which is a top 15 manufacturer so it wouldn’t be unusual that they would be importing a foam slitting machine. It would be interesting to look at the law tag on your mattress to see what it says.
There are a few Chinese foam manufacturers that are on the CertiPur list and your post led me to take a look today and the company that was listed in the import record (Shanghai Gaoyu Foam Products) is now listed on the CertiPur list under Glory Home Furnishings* (they weren’t listed the last time I checked a few months ago). Having said that they are listed for viscoelastic memory foam not gel memory foam or polyfoam which are separate categories.
ADMIN NOTE: *Removed 404 link|Archived Footprint: certipur.us/pages/find-a-foam-supplier/shanghai-glory-home-furnishings-co-ltd/
Of course this says nothing about the quality/density of the foam and I would want to know the density of all the layers in any mattress I purchased.
I think that one of the biggest difficulties with this type of research that leads to Chinese sources is that there are so many uncertainties involved and so many dots to connect together that it can be very difficult to find out accurate information that you can verify. In these cases the approach that I generally take is that I treat the high level of uncertainty itself and the lack of transparency as a risk factor which means that finding out reliable and trustworthy information (such as foam density) would become even more important.
Sometimes a member here will connect some dots that leads to a new trail (such as in this topic about a foam supplier that I was never able to find out where they sourced their polyfoam or memory foam) so if you do find out any additional information it would be great if you could post it here.
Phoenix