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of memory foam

Density refers to the cell structure; the higher the density the narrower the cell structure. Density can be made higher by applying pressure thus in a high density object the cells will become smaller thus the density increases. The only thing density tells us is about the cell structure and how much it weighs. It doesn’t indicate anything of the quality of the viscose polyurethane and tells us nothing over the hardness or softness of the foam (bed). Soft, medium or firm can all be made from the same density of e.g 50kg m3. So it’s not like with polyether that the more volume weight, the more kg in a cube the better. The memory foam only weighs more; it does not make it better. With memory foam we talk about kg m3, this gives us the density and in turn the cell structure make up. In cold foam we talk of HR (High Resilience) and cold foam is in principal similar to polyether in that the higher kg m3 the better.
A higher density will react better than the lower density foams. The high density feels harder and reacts slower making it slightly heavier to move around while sleeping in your bed. When the cells are smaller this automatically means the mattress provides poorer ventilation (the materials ability to breathe). It will become warmer and it will take up less moisture, this is because the foam will become more compact if the density is higher. Also, a higher density will also react stronger on temperature differences and will react slower on smaller margins in temperature differences.

In the medical field a higher density than 50kg m3 is never used. Be careful, there are some “colleagues” that claim to sell medical mattresses that are in fact of a density of around 70kg m3 which is therefore not medically certified.

40Kg/m³ 50Kg/m³ 70Kg/m³ 80Kg/m³
Densiteit van 40kg/m³ Densiteit van 50 kg/m³ Densiteit van 70kg/m³ Densiteit van 80 kg/m³


In the last couple of years I have seen a lot of new memory foams on the market with a density of 70-85kg m3. I can assure you this higher density does not give the same level of comfort as 50kg m3 memory foam. The mattress will have poor ventilation and will definitely be of a lesser quality with it being warmer for the occupant because of this high density.  From cologne “the biggest mattress fair in Europe”, this year I saw a few new brands that looked good, reacted well and worked with a density of 35-40kg m3. However, when the density becomes too low it will also affect the durability (lifespan) and so in my experience is that 50kg works perfectly and offers the best comfort.