There are many different models of cold foam mattresses. We have been able to test several of these.
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Some mattresses are completely made of cold foam and do not include any other foam layers. Other mattress models, however, have one or two additional foam layers. Often, these will be integrated Visco or latex foam layers, or even gel foam layers.
There are even some models that offer two different degrees of firmness depending on which side of the mattress you choose. These are particularly interesting. These types of mattresses use different foam layers for the top and bottom sides. The mattress can then be turned to the side that provides the ideal firmness for your needs.
7-zone cold foam mattress
A 7-zone cold foam mattress is a mattress that has been divided into comfort or contour zones. These zones help stabilise the body and relieve pressure on the spine.
The individual zones correlate to the different pressure points of the human body. The position you sleep in will affect the specifics but, in general, it is better to sink a little deeper in some places and a little less in other places in order to achieve an ergonomically correct lying position, keeping the spine straight at all times. There are usually pelvic, shoulder, lumbar, head, and foot zones.
Most zoned mattresses are divided into 5, 7 or 9 comfort zones. Either way, it will always be an odd number. This is due to the mirror image structure of the mattress: the middle area is always for the pelvis, then the lumbar zone, then the shoulder zone, and, finally, the head/foot zones. This mirror image ensures that no matter which way you lie on the mattress, you will always be using it correctly.
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