According to its tag, this mattress is 45% polyurethane foam, and only 55% latex. Since we bought it to avoid off-gassing, that ratio wasn't going to work for us. It was also extremely soft-- soft enough one sank down all the way to the box spring.
This is not a latex foam mattress as it was described to be. I had to call the company to find out that there are only 3" of latex foam, with 8" of polyurethane foam underneath it. It makes an indent that doesn't pop back up, almost within 3 or 4 nights. Very uncomfortable. If you want latex foam, this mattress is a waste of money.