Hello Endymion!
I understand your concern regarding heat retention. While all foams are insulators to a degree, there are also other factors and interconnected variables including your own heat tolerance even within the “sleep hot” range. The more you sink-into a mattress (the plusher it is) the more potential you have for sleeping warmer. (Memory foam is the least breathable foam, followed by polyfoam and then latex) In very general terms … the materials, layers, and components of a sleeping system that are closer to your skin will have a bigger effect on airflow, moisture transport, and temperature regulation than materials, layers, and components that are further away from your skin. While the .1" is cotton & wool will certainly mitigate temperature regulation issues and because all layers work together … the 1.5" quilt poly layer would be less breathable and temperature regulating than the latex below and the Stretch Knit Cotton and Joma Wool. See more in post #6 in this thread about what makes a mattress ‘hot?’.
[quote]Would the Brooklyn Bloom Hybrid (or something like the Plushbeds Luxury Bliss) sleep cooler because they avoid polyfoam in the top layers of their mattress? Unlike Nest, it looks as if Brooklyn Bedding and Plushbeds opt for a cotton/wool upper layer only.
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Cotton and wool are more temperature-regulating than synthetic materials. Wool and Alpaca are great temperature regulators because they trap air (which is an insulator) but also allows humid air and moisture to be transported away from the body and stores moisture inside the fiber which is moving it away from the skin thus keeping the cooling cycle going (which is why it is used so successfully in both cold and hot climates).
Depends on the cause of the “mild back” soreness. If its an alignment issue it is most likely better to err on the side of caution and opt for a firmer bed. You can read more about different “symptoms” that people may experience seeping on a mattress (in Post #2 which is a primary reference post)… The only way to know for certain whether a specific mattress is a good “match” for both of you in terms of comfort, firmness, and PPP is based on your own careful testing or personal experience. If you can’t test in person then there will always be some risk and uncertainty involved because the specifics of the mattress itself along with your own body type, sleeping position, and preferences can affect which would be the most suitable choice.
The best way to get closer to what you can expect from any specific product would be a conversation with the manufacturer (in this case both NestBedihng and BB have a great track record of knowledge, expertise, and excellent customer support that can help choose the type, thickness, and firmness for a mattress that has the least possible risk and the best chance for success.)
I hope this adds a bit more depth to the great interaction you’ve had with our moderators and subscribers. I am looking forward to an update!
Phoenix