Foam Vs Spring – What we chose for the Woosa Mattress Core

Inside The Mattress | by Tyler Peh | 08-Nov-2019

Deciding between Springs vs Foams

As we exposed ourselves to the different types of springs and foams from various countries, we had to choose a foundation core that is high quality, well balanced and not too expensive.

Spring manufacturers are aplenty especially in Asia, and are easy to source- however, none of the springs we encountered matched our desired level of quality and feel. We especially hate how springs work: Energy is stored within the spring when compressed, and the spring would naturally want to force itself back to its uncompressed state. This results in a lot of unnecessary pressure points on the body. Spring mattresses are also reported to have the lowest level of satisfaction in external reports.


We eventually asked ourselves, if we made a bed out of purely pocket springs, would you feel comfortable on it? The answer is an immediate no- not only is it literally hard as steel, the unevenness of the surface would make it unusable by itself. Many layers of foams are needed to make the spring usable, so why use it in a mattress?

(Source: Google Images)

We then shifted our focus to ultra-high-quality PU foam bases. However, the initial concern we had with foam as a base material is the same as everyone else:

Will it sag after after a while?

That’s when we were introduced to extremely high-quality PU foams made in Europe, that are tested to outperform traditional springs in terms of rigidity, durability and weight distribution. These foams are engineered to last for at least 10 years without any discernible sagging. Testing it for ourselves, we immediately knew it would make an excellent core.

The HD foams act like millions of tiny molecular springs, distributing weight evenly throughout the surface, offering superior weight and pressure distribution that springs will never be able to achieve.

Image result for high density foam vs low density
(Source: Google Images)

Using a solid foam block, we were also able to avoid feeling vibrations from poorly wounded coils, or feel the hard springs through the foam.

After conducting further blind tests with our test respondents in Singapore, we eventually went with a High density + a higher quality High Resilience foam combination.

The extra layer of HR foam serves as an extra layer of support buffer for heavier users (>80kg), and allows a seamless transition to the firmer base core.

Ultimately, the decision was made based on the best balance between all our main priorities for a foundation core: durability, low partner disturbance, even weight distribution, deep level support and overall affordability.


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