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What is foam density and how does it affect my mattress?

What is foam density and how does it affect my mattress?

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Foam density is the mattress equivalent of the offside rule. It’s a vague and unexplained concept for sleepy shoppers. Does it make a mattress firmer or softer? Does it make it last longer? How do we measure it? And ultimately – does it matter? Well puzzle no more, because we’re here to answer all of your questions in plain simple English.

What Is Foam Density?

Density is the primary means of measuring the quality of foam. Density is measured in cubic metres (m³) so foam with a density of 60kg will weigh 60kg if you have one cubic metre of it. A higher density mattress (eg. 75kg) has more foam fitted into each cubic metre so it weighs more (75kg per cubic metre). A lower density mattress (eg. less that 40kg) features a less compressed foam with more air pockets, so it weighs less (45kg per cubic metre).

Is Foam Density Important?

Yes. But it’s not the be all and end all – it’s one of several important features which come together to create the perfect memory foam mattress for you. Think of your mattress like a sports car. If it has an amazing engine but sub-standard tyres and an unprofessional driver … it’s not going to win the race. Well, mattress density is the same thing. It’s just one factor.

Does It Control How Comfortable My Mattress is?

No. Foam density plays a role in comfort levels, however mattress depth, composition and support levels are just as influential. And the most important thing by far is finding a mattress which suits and supports your sleeping habits. Back pain sufferers, side sleepers, front sleepers, restless sleepers, heavy sleepers – these habits determine the best mattress for you, and foam density is not the only thing which is different.

If you aren’t completely sure which mattress you need, you’re always best giving us a call and purchasing a product which you’re 100% happy with. We’ve got a whole load of mattress wisdom to share. Click here to get in touch. If you prefer doing it all online, check out our 9 step guide for choosing the perfect mattress. Click here to read.

Does It Control How Long My Mattress Will Last?

Yes, foam density is very important for this. High density foam is more durable and as a result high density foam mattresses last longer. These high density products usually come with a long warranty (5+ years) as proof of the manufacturers’ confidence.

What Foam Density Should I Aim For?

Before we jump into the figures, please remember that the composition of the mattress is just as important – if not more so – than the density of the foam in it. A lower density memory foam mattress which is suitable for you is a lot better than a high density item which is not. We always recommend getting in touch and having a chat to make sure that your memory foam mattress suits your individual needs.

High Density Foam

Mattresses with a comfort layer of foam with a density of 55kg and above are fairly high density products and will last a long time with daily use making them the best option for your main bed at home. They tend to cost a little bit more – but when you consider the length of time which your new mattress will look after you for, high density foam gives you far better value for money. We have a wide range of high density foam mattresses to choose from.

Medium Density Foam

Mattresses with a top layer of 45kg to 55kg density foam are medium density items, suitable for guest bedrooms which are used on a semi-regular basis, hotels, rental properties and B&Bs.

Lower Density Foam

In terms of the top comfort layer of a mattress (which is usually memory foam), foam with a density of 45kg or below would be considered low density. Low density items are perfect for guest bedrooms which aren’t used all the time. Such memory foam mattresses won’t last as long but are available at a more affordable price, and are perfect where a long lifespan and the ultimate in quality aren’t necessary.

For The Base Layer of a Mattress

When considering the foam density of the bottom/ base layer of a foam mattress, you’re looking for different things in terms of density. This is because base foams are a lot firmer and more supportive than soft mouldable foams which are used in the top comfort layers (memory foam and similar materials) – so you don’t need to pack as much of it into each cubic metre to get the support you need.

Bearing this in mind:

  • Base foam with density of 30kg/m and below is considered low density
  • 30kg/m to 35kg/m is considered medium density foam
  • High density base foam is anything over 35kg/m

How Do I Find Out The Foam Density of a Mattress?

A lot of mattress suppliers aren’t as forthcoming as we are when it comes to the density of their memory foam mattresses and products. It’s always concerning when a supplier hides this information. It’s a bit like buying burgers and not knowing what meat they contain; or splashing out on a new laptop without knowing how many pixels it will display.

Any reputable supplier will tell you what density foam they use in their items. We list our foam densities on the product page for complete transparency when you’re making your purchase. If a supplier won’t tell you the density of the foam in their product then it’s safe to assume it’s not very high and you should be wary of buying it from them!

Find the right mattress for you! We have a range of exquisitely comfortable single, double and king size memory foam mattresses, plus many more sizes and collections available. Browse our memory foam mattresses here


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