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ILD + Density

2 min read

As you may know, we use two densities of latex in our mattresses: Medium and Firm. Please note that there isn't an ILD for the mattress, but an ILD for each individual layer of latex.

Latex Firmness ILD
Density [kg/m3] Density [lbs/ft3]
Medium 26 - 29 75 4.68
Firm 34 - 37 85 5.31

Many people try to use Indentation Load Deflection, commonly known as ILD, as a metric when trying to decide which mattress to buy. We are happy to share our ILD data with you, but we also caution you not to base your decision on that number alone. This is one of the reasons why we prefer to not publicly display the ILD as a marketing tool — because you need a decoder ring and a flashlight, and without it you may select the wrong firmness.

We'd caution against using ILD alone to make a direct comparison especially with something as subjective as comfort. Like going to buy a pair of sneakers, a size 12 in a Nike isn't the same in New Balance or any other company. In fact, we made a video about the differences of ILD.

There a lot of other factors beyond ILD that affect the feel like thickness of the latex, density, pinhole diameter, etc. and there are other factors beyond the latex alone that affect the feel of the mattress like the type of fabric, quilt pattern, tightness/looseness of the cover, etc. We could two design a mattress using identical latex and make one feel a lot firmer just by changing the cover.

Keep in mind that firmness is totally subjective. One person's firm and can be another one's soft. For example, we did a focus group and put ten people in a room to test out the medium, five may said it is medium, two said it is soft, two said firm, and one thought it is extra firm. It depends on the person's past experiences, height, weight, and sleep position. This is where in store testing may be helpful because it helps us come to closer idea of what is soft, medium, and firm, but it isn't foolproof.

We know it would be easier if there was one unified number, but feel is ultimately subjective and based on more than a single input test like ILD.



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