Hi Nene1957,
Cushionflex would be a polyurethane foam that is used in the quilting of the mattress and it could certainly be part of the issues you are experiencing.
According to the Northwest Bedding website warranty information here … the warranty exclusion for the depth of impression that is considered “normal” is 1.5" so if you have impressions that are deeper than that without any weight on the mattress and that aren’t the result of any sagging in your support system then I would call them to initiate a warranty claim.
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How much you sink in when you are lying on the mattress is relative to the firmness of the comfort and transition layers in the mattress so if you are sinking in too much when you lie on the mattress it’s more likely that you have a mattress that is too soft rather than a mattress that is defective.
On the other hand … if the visible impressions in your mattress are 1 7/8" without any weight on the mattress then you would likely have a warranty claim. This certainly isn’t how “latex works” and it also appears that the store isn’t providing you with accurate information about the warranty criteria for your mattress and I would call the manufacturer to find out the specifics of your warranty.
They are correct that with a mattress that has a cover that is quilted with either natural or synthetic fibers or with quilting foam the most common warranty exclusion in the industry is 1.5".
Mattresses that aren’t quilted and that use premium materials in the top layers such as latex or memory foam in the comfort layers often have a warranty exclusion that is .75".
While their mattresses certainly use high quality and durable materials … it’s also true that some of the members here that have purchased from them have experienced some delays and customer service issues after their purchase that has been the source of some frustration (see the link after their description in the online memory foam list here). A forum search on Select Foam (you can just click the link) will also bring up more forum comments and feedback about them as well. NOTE ADDED: Because of ongoing customer service issues and delays Select Foam’s membership has been terminated and I would read the warning here before considering them.
While it’s not possible to quantify the sleeping temperature of a mattress for any particular person with any real accuracy because there are so many variables involved including the type of mattress protector and the sheets and bedding that you use (which in many cases can have just as significant an effect on temperature as the type of foam in a mattress) and on where you are in the “oven to iceberg” range and because there is no standardized testing for temperature regulation with different combinations of materials … there is more about the many variables that can affect the sleeping temperature of a mattress or sleeping system in post #2 here that can help you choose the types of materials and components that are most likely to keep you in a comfortable temperature range. Latex in general is the most breathable and temperature neutral of all the different foam materials (latex foam, polyfoam, memory foam) but there are many other reasons including the layers and components above the latex and the firmness/softness of a mattress that can affect the sleeping temperature of a mattress as well.
Phoenix