⌁Latex Living Lab
Firmness

Latex mattress firmness: labels are only the starting point

Firmness describes perceived resistance at the sleep surface; ILD is a laboratory measure of how much force is required to compress latex by a specified amount. They are related, but they are not interchangeable consumer experiences.

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ILD helps compare latex layers

Sleep Foundation notes that latex firmness is commonly measured using indentation load deflection (ILD). But a finished mattress also includes covers, wool, other layers and a support core, all of which change the final feel.

Background: Sleep Foundation.

Why the same mattress feels different to different people

  • Body weight changes how deeply layers compress
  • Side sleeping concentrates pressure at shoulders and hips
  • Back and stomach sleeping often reward stronger midsection support
  • Thick toppers and protectors can alter surface feel

Applying this to Eco Terra

Eco Terra currently lists Medium latex at 24–26 ILD and Medium-Firm at 29–31 ILD.

Compare the two Eco Terra firmnesses →

Affiliate disclosure: Latex Living Lab may earn a commission when you purchase through qualifying links, at no additional cost to you. Editorial conclusions are independent. Product specifications and policies can change; verify current terms with the manufacturer.

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