ILD — indentation load deflection — is a measurement standard that latex manufacturers use to classify one aspect of the rubber’s profile. In this video we explain how different types of latex can have the same ILD, but have completely — and we mean “completely” — different feels.

ILD can be a helpful metric to have when shopping for a natural latex mattress, but we think there are better criteria to consider.

Here’s a transcript of the ILD video:

Today we’re going to learn about ILD. Be prepared, we’re going to get a little bit technical. ILD stands for Indentation Load Deflection. It is a test that looks at how much force is required to compress the latex by 25% and even 40%. It is two percentages, not a single number.

We have two samples here that have the same ILD. Layer A is 100% synthetic and has an ILD of 17.5 to 25.5 at a 25% compression. Layer B is our natural latex and has the same ILD as the synthetic. These two layers are almost identical. Both are continuous pour latex made in the U.S.A. in the same facility. The key is they have different densities. As you just saw, the weight sinks more into the synthetic latex but with the natural that has the same ILD but a higher density, the weight is lifted up more. So the ILD is the same for the natural but when you put the weight on there, the density will actually push the weight up higher than a lower density synthetic. The pounds per cubic meter is higher in a natural than in a synthetic.

The key takeaway is not to use ILD exclusively in determining the mattress that is right for you. So if you want to know more about ILD or we’ve left you confused, feel free to send us an email, give us a call, we’re happy to help.

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