The different densities in foam are used for different things. For example; A firmer foam isn't really a lesser valued foam if it can serve a specific purpose like for instance in the bedding industry. The lower density foams are less in cost, however the better quality foams like the much softer ones, don't really have a place in that specific role. With that being said, on the other hand, the higher density foams or the softer ones are the ones used in the bedding industry for the comfort layer in a sleep set where as this foam would not really have a role in the "support" role in the sleep set.
Visco-elastic foams are not really specifically designed to "support". They were originally designed to absorb G-force in the seat of the space shuttle. 10 - 11 years ago the bedding industry got a hold of the stuff and the rest is, how they say, "history". Hope this helps...Happy Trekking...sabre11004...

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