All natural latex comes in different firmness levels. ILD and density are the ways we measure how firm or soft a piece of natural latex will feel. To explain the ratings:
Indentation Load Deflection (ILD) is a test that was standardized in Great Britain for testing the firmness or hardness of polymer materials. ILD is measured by indenting (or compressing) a foam sample to 25 percent of its original height. The more force required, the firmer the foam.
Density is a measurement of the mass per unit volume expressed as kilograms/cubic meters. Density in natural latex for mattresses usually varies from around 60 kg/m3 to about 95 kg/m3.
Both ILD and Density are ways of measuring the firmness of natural latex. The greater the ILD and the greater the density, the firmer the natural latex will be.
On our standard Avocado mattress, we use two seamless layers of Dunlop latex: 2 inches in the comfort layer (D75 / 20-25 ILD, medium); and a denser 1-inch layer (D85 / 26-31 ILD, medium firm) as a core base component under the innerspring support coil unit.
On the Avocado Mattress with the optional Pillow-Top, we use three seamless layers of Dunlop latex — 2 inches in the Euro-top layer (D65 / 14-19 ILD, soft), 2 more inches in the comfort layer (D75 / 20-25 ILD, medium), and a denser 1-inch layer (D85 / 26-31 ILD, medium firm) as a core base component. No blended or synthetic latex is used, and there are no seams to break down over time or chemical adhesives.