Hi jonmarrow.
It’s impossible to say with the vague specifications they offer on their website.
They don’t offer foam densities anywhere. If what they listed in 2016 remains true…The Arctic Dreams uses 3 lb density high performance polyfoam in the comfort layer and 1.8 lb density polyfoam in the base layer so there are no lower quality materials or weak links in the mattress that would be a cause for concern in terms of the durability or useful life of the mattress relative to more average weight ranges (lower 200’s or so or less).
You may be able to reach out directly and ask if these specifications are still accurate.
NikkiTMU