Hi pressurepts,
Their foam is US made and CertiPUR certified yes.
If you call them they will tell you the specifics of their fire retardant barrier fabric but it would also be non toxic (that doesn’t use added chemicals).
They certainly have some great quality/value mattresses that are close approximations to the Tempurpedic lineup and they use the same or better quality materials as well at much lower prices.
While it’s a small minority, a few of their customers have experienced some delays and customer service issues after their purchase that has been the source of some frustration (see the link after their description in the online memory foam list here). A forum search on Select Foam (you can just click the link) will also bring up many more forum comments and feedback about them as well.
They would certainly be a good quality/value choice that would be well worth considering and talking to.
NOTE ADDED: Because of their ongoing customer service issues and delays their membership has now been terminated and I would read the warning here before considering them.
Phoenix