All natural or organic latex comes in different levels of firmness. Indentation Load Deflection (ILD) and density are the ways we measure how firm or soft a piece of natural latex will feel.

Standard mattress – 3" of D65 medium-plush latex
Pillow-top mattress – 5" of D65 medium-plush latex.

Indentation Load Deflection (ILD) was a test 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 measures 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 density, the firmer the natural latex.

Our Ratings:

On our standard Avocado mattress, we use two seamless layers of Dunlop latex: 2 inches in the comfort layer (D65 / 14-19 ILD); and a 1-inch layer (D65 / 14-19 ILD) as a core base component under the innerspring support coil unit.

On the Avocado Green 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), two more inches of D65 latex in the comfort layer, and a 1-inch layer as a core base component. We don't use blended or synthetic latex, and there are no seams to break down over time or chemical adhesives.