Hi PAFred,
As you know their standard configuration is a Talalay comfort layer but you could always give them a call and ask if they can replace it with Dunlop.
I don’t have any personal experience with any of their covers so I can’t speak to any of the specific differences between them (such as the amount of wool in each of them or any specific differences in the cotton fabrics) but the covers from Savvy Rest, SleepEZ, and Flexus are all cotton covers that are quilted with wool so they would at least be “similar”. Each of them would be able to provide you with more specific information about the details of their covers when you talk with them on the phone that can help you compare them. There are a few comments about how the SleepEZ cover compares to the Savvy Rest in post #31 here but I don’t know whether the Flexus cover is quilted with wool on one or both sides. With a quilted cover the stretch knit is usually on the top surface and the fabric backing on the other side of the quilting is usually a weave but again they can provide you with more specific information about each of their covers than I could.
SleepEZ and Flexus both use 100% natural Dunlop from Latex Green while Savvy Rest uses 100% natural Dunlop that is certified organic and made by CoCo latex. There is more about certified organic Dunlop vs 100% natural Dunlop in post #6 here but in terms of feel, performance, and durability they would be very closely comparable if the layers are the same thickness and firmness/density.
If their mattress includes 8" of latex then there would be at least two layers of latex inside it because latex cores are only 6" thick (or sometimes less). The only way to know how comparable they would be in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) would be based on your own personal testing and experience and it would depend on the specific firmness of each of the layers in the two mattresses you are comparing and on any significant differences in their covers.
There is more about the pros and cons of a single 6" layer vs two 3" layers in post #2 here.
They are certainly a great quality/value mattress as well. There are a few comments about it and some of the more specialized components it includes in post #8 here from yesterday.
Overall though … when you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart (which would certainly include Flexus, SleepEZ, and Cozy Pure) and who can help “talk you through” the specifics of their mattresses and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs to different body types, sleeping positions, and preferences or even to other mattresses that they are familiar with (such as Savvy Rest) than anyone else (including me).
Phoenix