Hi sung,
You were wise to be skeptical 
This is the Boyd Natural Flex 910 and you can see the specs on the Boyd website here.
I have mentioned their engineered latex mattresses in several places in the forum (such as here) because unfortunately … what Boyd calls “engineered latex” … isn’t latex at all but polyfoam that has been fabricated to feel somewhat like latex.
I don’t know the density of the polyfoam and it would still be good value even for a polyfoam mattress (and I would still want to know the density of the polyfoam in both layers) … but it’s not latex, Dunlop or Talalay.
You can also find them at Sams Club here for a little less for those who are interested in a low cost polyfoam mattress.
Phoenix