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normal Review: Sleep EZ 13" latex bed + advice on layer stacking?

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11 Nov 2017 11:38 - 11 Nov 2017 11:38 #21 by Phoenix

Hi buttercupbetty,

All of the layers of a mattress work together to provide comfort and distribute the load placed upon them. All the layers of a mattress actually compress simultaneously not sequentially and they will each compress to different percentages of their thickness depending on their position on the mattress, the firmness of each layer, the compression modulus of the material, the thickness of each layer, and the compression force that they are exposed to (which depends on the weight of the part of the body in contact with the mattress and the surface area that is bearing that weight which is constantly changing as you sink into the mattress more or change sleep positions).

While "going through" a layer is commonly used as a way to explain things because there is a different amount of force that "goes through" a layer and compresses the next layer of the mattress depending on the hysteresis of the material (how much energy it absorbs) and on how point elastic the material is (how much compression affects or is affected by the surrounding areas of the layer) ... it would be just as accurate to say that you will "feel through" the top layer meaning that you will feel the properties of the next layer down to different degrees. Even the softest latex won't "bottom out" (meaning it has no more ability to compress because the walls of the cell structure are fully compressed on top of each other) if it is on top of another foam layer and will have the ability to compress more yet even though very soft latex will compress to a much larger percentage of its thickness than a firmer layer. Every layer of a mattress affects and is affected by every other layer in the mattress to different degrees, even if you may not feel as much of a difference between a three and four layer design.

The compression of each layer (mainly controlled by thickness, firmness, compression modulus, hysteresis, and position along with a few other specs) are what creates the pressure relieving cradle of a mattress in the top layers which re-distributes weight and pressure on the bony prominences and pressure points of the body while the resistance to further compression of the deeper layers is what "stops" the heavier parts of the body from sinking down too far and putting the spine and joints out of their natural alignment. The balance between the opposing needs of pressure relief and spinal alignment is the main factor behind all mattress design and theory and why different mattresses match the body types and sleeping positions and preferences of different people ... or don't.

Without personal testing and going through the learning curve of becoming familiar enough with different types of materials and layering and how they work in combination with each other to predict how a certain layering may work for you ... you would be much better off simply going with the suggestions of a knowledgeable retailer or manufacturer who is familiar with how the different options they offer fits the "averages" of people who may be similar to you. It may very well be that you personally would feel quite comfortable on a three layer combination, and there certainly wouldn't be a "need" to go to a fourth layer with your BMI unless it was a personal preference for the comfort difference you may have noticed when testing out different configurations.

There is no formula that can predict with any certainty what type of layering you may do best with that can possibly be more accurate than your own personal experience and without this the next best way to decide on the design of a mattress is to use the "averages" of a manufacturer for people of your weight range, body type, sleeping style, and personal preferences.

Phoenix


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Last Edit: 11 Nov 2017 11:38 by Phoenix.

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11 Nov 2017 14:03 #22 by Debbiec

I did try the 10" mattress and found it uncomfortable. Don't remember the configuration. Found adding the 4th layer or topper in soft was more comfortable to me. The 13" is what I ordered. The configuration you mentioned T-S T-M T-M T-F. Is what was recommended to me. But trying in the store, I felt was too soft for me. So I went with the 2 firm layers. It is firm . If you like a softer feel I don't know if you would be happy with 2 firms or the firm and xfirm. If it was me I would go with the 2 mediums first. But what do I know. Just my opinion. Hope you find a good combo. Would be interested to know what you decide and how you like it.

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11 Nov 2017 14:32 #23 by Debbiec

Hi Phoenix
That is interesting what you said about the savvy rest cover. Maybe that is why I am adjusting a little better now. Hopefully it will soften up a little more. The top layer which is T-S is in its own cover. I guess both covers would be the same. Hopefully it applies to that also. Was just disappointed that I didn't feel that pressure relief that I was expecting (bc to me felt firmer than I was expecting) Don't know if switching out 3rd firm layer with med. would give me the feeling I was expecting. I did put a wool mattress protector from savvy on it. Maybe that helped a little also. With savvy I would need to pay for the layer exchange if I Decided to try the medium layer. Haven't decided yet . Would hate to do that and not be happy. Will give it a little more time.

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11 Nov 2017 18:31 #24 by buttercupbetty

Thank you! I will let you know what we decide to purchase!

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12 Nov 2017 11:36 #25 by Phoenix

Hi Debbiec,

Yes, the Unity Pillowtop is actually the Serenity mattress with the Harmony topper. Both use the same cotton quilted to wool cover as the top panel on their encasement, and this tends to be a bit stiff when new, but it will soften with use over time. Additionally, you have your wool mattress protector, along with your fitted sheets. With “stiffer” materials like the encasement that Savvy Rest uses, you‘ll find that it takes a bit longer for these items to “relax” and soften up a bit, so I would agree with you to give this a bit more time before considering any exchange options.

Phoenix


Researching for a mattress?... Be sure to read this post first.

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12 Nov 2017 21:55 #26 by buttercupbetty

Thank you for clarifying that the Unity Pillowtop is actually the Serenity with a three inch topper. I am hoping to compare a 3 layer, 10" mattress with a 4 layer, 13" mattress. But the topper will feel much softer, right?

Maybe I can find a store with a 13" latex mattress within one encasement....

~BB

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13 Nov 2017 14:12 #27 by Phoenix

Hi buttercupbetty,

I am hoping to compare a 3 layer, 10" mattress with a 4 layer, 13" mattress. But the topper will feel much softer, right?


Assuming all of the layers used are the same, there can be a slight variation in 4-3” layers contained in a single encasement versus 3-3” layers in a single encasement with a 3” topper in its own encasement placed upon that mattress. A separate topper can be less “encumbered” when placed in its own separate encasement, and it can be allowed to contour a bit more than if placed within a tighter encasement with three other layers. But there is also the extra to layer of the encasement containing the 3-3” layers to be taken into account which can add a bit of “stiffness” between the base mattress and the topper. So in the end, the answer is “it depends”, and can be dictated to a degree by the mattress encasement material used.

Phoenix


Researching for a mattress?... Be sure to read this post first.

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14 Nov 2017 07:24 #28 by buttercupbetty

Hi Phoenix,

I somehow missed your response. This is a helpful reminder to do our own personal testing. I called SleepEZ and Jeremy recommended the standard 10" (S-M-F) mattress. We are seeking 100% NT.

I appreciate your reminder about not "going through the layers". And that all latex layers will "work together". So while I am looking for a clear guideline, you have (once again) reminded me that there really is no substitute for my own personal experience.

Thank you!

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14 Nov 2017 12:37 #29 by Phoenix

Hi buttercupbetty,

You're welcome!

Phoenix


Researching for a mattress?... Be sure to read this post first.

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