UK -sleeping duck mattresses

[phoenix]

Hi Smoliu,

Welcome to the Mattress Forum!

“We use 20mm memory foam, 20mm latex (80% Natural, 20% synthetic sourced from Belgium) and 60mm high resiliency (high density foam), we make it a point not to reveal the densities and hardnesses of our foams but rest assured they are rated to last 10 years. There are approximately 800 springs in the king size (we have tried more, but are finding we get the best outcome with this amount) and the gauge is 2.3mm around the edge and 2.0mm & 1.8mm through the middle.”

While the latex and the springs are good quality materials and components … the polyfoam layer and the memory foam layer together add up to over 80 cm (3.15") which is more than “about an inch or so” of lower quality or unknown foam" in the upper layers of the mattress which the guidelines here suggest avoiding. At the very least I would want to know the density of the polyfoam layer (the memory foam layer is under an inch by itself) and if they weren’t willing to disclose this so you can make an informed choice about the quality/durability of the materials in the mattress I would pass it by.

They are CertiPur verified but alarm bells are going off about not revealing densities, obviously. say I decided to ignore that and go on trust, is 20mm of each foam layer enough to work? it seems awfully thin but then I guess if you have many layers theres only so high you can go. I’ve not really found much on here. (Or john ryan/mattress nerd) about layering so many types together, as while 20mm of memory foam seems too thin, as 20mm of latex is OK, does that mean it ‘protects’ the memory foam?

CertiPUR tests polyfoam and memory foam (not latex) for harmful substances and VOC’s and is a “safety” certification but it doesn’t provide any meaningful information about the quality or durability of the foam layers.

Every layer and component of a mattress will have some effect on the feel and performance of every other layer and component of a mattress and the mattress “as a whole” but whether any particular mattress design or combination of layers will “work” or not depends on how you are defining “working” and would also depend on the body type, sleeping style, and preferences and sensitivities of the person on the mattress along with the specific properties of each foam layer and the pocket coil itself.

The properties of thinner foam layers or components or layers or foam layers or components that are deeper in a mattress will be less noticeable than the properties of foam layers or components that are thicker or that are closer to the sleeping surface. It would be very unusual for a pocket coil mattress to only have 20 mm of foam in total on top of the pocket coil and for most people and most pocket coils this probably wouldn’t be “thick enough” by itself but it certainly could be “enough” in combination with other foam layers. Different types and combinations of foam layers will change the “feel” and performance of a mattress and some people may prefer one combination and others may prefer a different combination. Any particular combination of layers and components may be a good match for a particular person in terms of “comfort” and PPP (Posture and alignment, Pressure relief, and Personal preferences) and they may sleep well on it but the same combination may also be completely unsuitable for someone else to sleep on.

Of course I would always also want to confirm the quality and durability of the layers as well so that you have a reasonable idea of how long you are likely to sleep well before foam softening and the breakdown of the materials leads to the loss of comfort and support and the need to replace the mattress.

Phoenix