Latex Mattress Firmness & ILD Explained
A clear guide to how firmness and indentation measurements should—and should not—be used.
The core idea
This guide focuses on how firmness and indentation measurements should—and should not—be used. Latex is often discussed as if the material alone predicts comfort, but finished feel depends on thickness, firmness, layer order, support structure and the sleeper.
What to evaluate
Look at the whole construction. A 2-inch latex comfort layer over coils is a different product from a 9-inch all-latex core. Likewise, a modular mattress can make future firmness changes easier than a permanently assembled design.
Spindle publishes layer-level ILD ranges but cautions shoppers not to treat ILD as a universal comparison across different latex types and manufacturers. That is a useful rule for the category as a whole.
Use the information to narrow choices
Once you understand the mechanism, compare products on the feature that actually matters to you rather than assuming every latex bed behaves alike.
See current Spindle options
Spindle is a useful reference point for modular all-latex construction because its flagship mattress uses three separate 3-inch Dunlop layers.
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