Hi JJ85,
I provided you links in my previous reply about learning of the componentry within a mattress. The steps aren’t too difficult. To help you out a bit, I’ll list here in more complete detail my suggestions for selecting a mattress.
The first place to start your research is the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that can help you make the best possible choice … and perhaps more importantly know how and why to avoid the worst ones.
Two of the most important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of “comfort”, firmness, and PPP (Posture and alignment, Pressure relief, and your own Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists based on all the parts of your personal value equation that are most important to you (including the price of course and the options you have available after a purchase if your choice doesn’t turn out as well as you hoped for).
While again nobody can speak to how any specific mattress will “feel” for someone else or whether it will be a good “match” in terms of comfort, firmness, and PPP because this is too subjective and relative to different body types, sleeping positions, and individual preferences, sensitivities, and circumstances and you are the only one that can feel what you feel on a mattress … outside of PPP (which is the most important part of “value”), the next most important part of the value of a mattress purchase is durability which is all about how long you will sleep well on a mattress. This is the part of your research that you can’t see or “feel” and assessing the durability and useful life of a mattress depends on knowing the specifics of its construction and the type and quality of the materials inside it regardless of the name of the manufacturer on the label or how a mattress feels in a showroom or when it is relatively new so I would always make sure that you find out the information listed here so you can compare the quality of the materials and components to the durability guidelines here to make sure there are no lower quality materials or weak links in a mattress that would be a cause for concern relative to the durability and useful life of a mattress before making any purchase.
You can perform a forum search on any of the brands you mentioned and see where there were discussed previously here on the forum.
The Sapira mattress uses pocketed springs. The spring unit has a 1" layer of 1.8 lb 32 ILD polyfoam on the top and bottom of it, and then above that is 1.5" Of 4 lb 9 ILD memory foam and 1.5" of 3.65 lb 20 ILD Avena " high performance" polyfoam . For most individuals there would be no “Red flags” with these materials, but I would issue a “slight caution” for those of a higher BMI for the 4 lb memory foam.
The Kaya Sleep is another of the newer “boxed bed” mattresses and hasn’t been discussed previously here on the forum. It uses pocketed springs, on top of which is 1" 2 lb polyfoam, 2" 4lb memory foam, and 1" 5 lb “high performance” polyfoam. For most individuals there would be no “Red flags” with these materials, but I would issue a “slight caution” for those of a higher BMI for the 4 lb memory foam.
Tomorrow Sleep two different comfort offerings:
Medium firm
1" 3.5lb Memory Foam Layer
1/2" 2.5lb Air Cooled Comfort foam layer with Gel (not sure if this is memory foam or poly foam)
1.5" Dynamic Response Foam Layer (I believe 2.6 lb)
6" coils at the bottom for additional support."
Medium soft
1" 4.8 lb Viscoelastic (memory foam)
2" 2.5 lb foam layer with Gel (not sure if this is polyfoam or memory foam)
6" Series coil
6" x 3" Foam rails with Side Ventilation
1" thin base foam layer which the coils rest upon
The Medium Firm uses a total of 3" of comfort materials, with the memory foam being a bit lower than what I would normally recommend (3.5 lb vs. 4 lb) . The Medium Soft uses a higher density memory foam, and the polyfoam layer beneath that uses a better density of foam.
There are no “standard” definitions or consensus of opinions for firmness ratings and different manufacturers can rate their mattresses very differently than others so a mattress that one manufacturer rates as being a specific firmness could be rated very differently by another manufacturer. Different people can also have very different perceptions of firmness and softness compared to others as well and a mattress that feels firm for one person can feel like “medium” for someone else or even “soft” for someone else (or vice versa) depending on their body type, sleeping style, physiology, their frame of reference based on what they are used to, and their individual sensitivity and perceptions. There are also different types of firmness and softness that different people may be sensitive to that can affect how they “rate” a mattress as well (see post #15 here) so different people can also have very different opinions on how two mattresses compare in terms of firmness and some people may rate one mattress as being firmer than another and someone else may rate them the other way around. This is all relative and very subjective and is as much an art as a science. Which is a long-winded way to say that unfortunately I can’t predict how one of these mattresses might feel to you, and that can only be determined through your own personal testing.
Phoenix