About Memory Foam Density

About Memory Foam Density

The simple route to understanding memory foam mattress performance

If you’re shopping for a memory foam mattress these days, one of the first things you’re likely to come across is mentions of density, with “high density / HD” and “premium density” among the most commonly-used terms. This refers to the grade of the memory foam layer, which will usually be one of several layers within the mattress. Density has become one of the key areas that brands focus on promoting when it comes to memory foam mattresses, and rightly so, since it relates directly to the quality and performance of the mattress.

ergoflex mattressDensity levels are a potentially complex topic, but can be neatly summed up with a few simple points;

  • It’s an overall indicator of the quality of the mattress. A higher density level correlates with a more expensively manufactured foam that requires more of the raw material in production. A mattress with a true high density layer is more than likely to have similarly premium materials throughout.
  • It determines how the mattress will perform. Mattresses using higher density level memory foam layers will deliver superior performance on the traits you’d expect of memory foam; temperature-sensitive body shaping, consistent support, comfort and negation of the ‘roll-together’ effect.
  • It can affect the longevity of the mattress. The make-up of higher density memory foam material means that it is more durable than lower density equivalents, making it last longer.

Unfortunately, there appears to be a growing trend in the mattress industry to seize upon the hi-tech sounding terminology of density levels, and claim a ‘premium’ rating without any further explanation.

There’s actually no excuse to avoid revealing the density level of a memory foam layer, as there’s an independent industry standard rating system in place, and every brand is fully aware of how their mattress is rated under this process.

As a rule of thumb, the following scale can be applied;

  • Low Density: 40kg/m3 and below
  • Mid Density: 40kg/m3 to 60kg/m3
  • High Density: 60kg/3 and above

So, if a brand is claiming “high density” or “premium density” memory foam without revealing the specific rating of their foam then as a customer you’ve got a right to ask why. It does beg the question – if a brand it using real high density memory foam and promoting their mattress as such, why wouldn’t it reveal the rating?

ergoflex matress stretchOf course any memory foam layer, no matter which grade or depth it is, is significantly affected by the other layers of the mattress, and there’s a definite ‘sweet spot’ when it comes to how they perform together. However, when a manufacturer chooses mid to low density memory foam they’re making a conscious decision to cut costs, limit the performance of the mattress and effectively condemn it to a reduced lifespan – none of which are a benefit to the customer, especially if they’ve been led to believe that they’re buying a ‘premium’ mattress.

The Ergoflex 5G memory foam mattress has a visco-elastic layer rated at 85kg/m3, putting it clearly in the high density bracket. (In fact, Ergoflex introduced and popularised the phrasing “HD” in relation to high density memory foam when we commercially launched back in 2006.) By providing a true high density memory foam layer, along with premium quality materials in the subsequent Cool-Sleep airflow and foundation base layers, we can confidently stand by the performance claims that we make for our mattress. It will perform at the highest standards, and it will continue to do so many, many years after purchase. Having been in the industry selling Ergoflex mattresses for a decade now, we know this to the case.

Visit our Buyers Guide for more detailed information on density levels and how Ergoflex compares to the market leader.

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