Density, firmness, and durability are related but not interchangeable.
Separate the terms
Foam density describes material mass for a given volume, not whether a cushion feels soft or firm to sit on. Firmness measures resistance to compression. A sofa can combine layers to give a soft first touch over firmer support. The label 'high-density' is not a complete specification without a number and a clear explanation of where the foam is used.
Ask better questions
Request the seat's construction and whether the same foam is used in arms and back. Consider seat thickness and how the surface behaves near the edge. An online review taken just after unboxing is less useful for long-term performance than construction details and a meaningful warranty. Avoid assuming any single number guarantees years of comfort.
A good foam discussion covers layers, support, and intended use rather than treating density as a comfort score.
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