Categories: Mattress

Do Latex Mattresses Sag?

When you shop in a store or online for a mattress, one of the things you may worry about is how long it will be before the mattress begins to sag. They aren’t generally designed to last forever, after all. Over time, most mattresses do, in fact, begin to break down and lose their form.

An organic mattress produced from GOLS certified organic latex, however, is different. It is able to retain its shape and form for 20 years or more depending on the construction of the mattress. In fact, the longevity of a latex mattress is just one of the many benefits of an organic latex mattress, that sets them apart from traditional innerspring mattresses.

What is the Sag Factor in Latex and Other Mattresses?

The sag factor is the ability of a mattress to return to its original form after exposure to a pressure or a load.  Thanks to ISO 2439, there is now a standard of measurement to help determine the sag factor of foam mattresses, such as latex foam, urethane foam, and open-cell PVC foam. Polyurethane foam, for instance, has a sag factor of two, while highly resilient foams have a sag factor of three. Organic latex mattresses often have sag factors of four or five. Generally speaking, sag factors greater than three provide for exceptional comfort for sleep. Synthetic/blended latex often breaks down faster and sags a lot more. That’s why it is important to look for GOLS certified organic latex in your mattress.

Other Considerations that Impact the Sag Factor of a Mattress

It’s more than the materials used in the mattress that impact the sag factor. There are plenty of advantages latex brings to a mattress, but without good quality materials and the proper construction method, the mattress won’t be nearly as resilient over time as they continue to be.

Construction – Latex mattresses are made by two construction processes – Talalay and Dunlop. The Talalay process involves an additional step where the mold is flash frozen before it is baked and excess air is infused, making it light and fluffy. For this reason, mattresses made with talalay latex are best for top comfort layers and toppers. Talalay latex is not dense enough to provide proper support as a mattress core.

The Dunlop construction process provides greater sag resistance than Talalay over time. Dunlop latex provides a heavier, denser mattress core, which is where the support of your mattress comes from. The core is the largest, most expensive component of a latex mattress and a high quality core (GOLS certified organic latex) can be the difference between years of long lasting support or unpleasant sagging indentations after a short period of time.

Latex Quality – When it comes to the quality of latex, there are typically 3 tiers:

1. GOLS certified organic latex is the highest quality latex available.

2. 100% natural latex is 2nd best and not as good as GOLS certified organic latex. It is typically Oeko-Tex Standard 100 and/or Eco-Institut certified. Always check the certifications to see the breakdown of latex and make sure it is 100% natural latex.

3. Synthetic/Blended latex typically includes 70% synthetic latex and 30% natural latex. The synthetic ingredients that help reduce costs while also sacrificing some of the quality you expect from 100 percent natural foam. This latex will break down the fastest and sag.

Ultimately, it’s worth taking a little time to explore things like mattress warranties, guarantees, and what the warranties cover in order to be certain you’re getting the greatest possible value for your mattress investment. Dollar for dollar, it’s hard to go wrong with organic latex mattresses that are designed to last 20 years or longer.

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    Amber Merton

    Amber Merton is an accomplished writer on the topics of green living and sleep. Her work has been covered in numerous online publications. Amber has been a regular author on the PlushBeds blog for the past 7 years.

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