Providing the greatest degree of support among all types of foam mattresses, those with higher density are the best choice for people with back pain. Longevity: High-density foam mattresses last much longer than their lower-density counterparts.
Back to foam vs. memory foam: So foams are made through several processes but memory foam is an open cell structure that is more dense. ... Memory foam has been manipulated to be more dense and of course over time to be cooler and more responsive than your typical furniture foam or pure foam which can be made very cheaply.
some foams are rated as High Resilience, which is a high-quality cushion foam with a density of 3 pounds per cubic foot. Latex foam, which is made from rubber, not polyurethane, can have a density of 3 to 15 pounds per cubic foot. Memory foam is a poly foam but manufactured to produce a super-high density product.
