Hi kayla j,
Biofoam is polyurethane foam, except that a very small portion of the polyols that compose the polyfoam (derived from refined crude oil) have been replaced by some plant alcohol (usually soy)
High resilience foam is also a polyurethane foam.
The HR foam layer at 1.9lb density seems low, here’s more on the subject
Are you sure you’re getting 100% natural talalay I’m only aware of 2 manufacturers that make this and it’s quite expensive.
Even if it’s not all natural, talalay latex is a superior product, and should be durable.
At 765$ Canadian, this is a decent mattress for the price and should give 6-10 years of comfort.
Did I answer all your question?
Please let me know if you need any further information.
All the Best!
Mario