When you go into a store or online and purchase a mattress, any mattress, one of the things you 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.
However, latex mattresses are birds of different feathers. They are able to retain their 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 a 100% natural 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. Natural latex mattresses often have sag factors as high as four or five. Generally speaking, sag factors greater than three provide for exceptional comfort for sleep.
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 the proper construction method and other mitigating factors, the mattresses wouldn’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. For this reason, mattresses made with the Dunlop construction process often provide greater sag resistance than Talalay over time. However, both construction methods are much more sag-resistant than almost any other mattress on the market today.
Quality of Foam - There are four main latex mattress types on the market. One hundred percent natural latex foam is the highest quality foam available. It comes with a premium price tag as well. However, for the extra money, you enjoy even more life from your mattress. Blended latex foam is often referred to as natural foam. But it does include synthetic ingredients that help reduce costs while also sacrificing some of the quality you expect from 100 percent natural foam. Hybrids are a combination of latex foam and another type of mattress material, such as polyurethane foam or even an air mattress. They tend to have lower costs and shorter shelf lives. The least expensive latex foam (and often the easiest to compact or sag) is the completely synthetic latex mattress.
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 all natural latex mattresses that are designed to last 20 years or longer.
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