Hey Brenda,
Welcome to the Mattress Underground ! Thanks for your kind words on the site and for your question.
Sorry to hear about the frustrating experience with your Nature’s Embrace Alto; two years is a long time to endure a too-firm sleeping environment. It does sound as though dunlop latex is a little too firm for your comfort/ support preferences. Also equally frustrating is a lack of a comfort exchange from the dealer, an important policy that should have been explained clearly before your purchase.
I’ve condensed excerpts from you post a bit to get to your question on feather toppers, hope that’s okay. I did some searching here on the forum to see what others’ experience has been with feather toppers, feather beds, etc. and found several posts out there but thought this response by Phoenix on topic “Pros and Cons of a Featherbed” interesting as a discussion of Down vs Feather initially but in the end relating to your question:
[i]"Down lasts longer and is more “comfy” and less “crunchy” but it compresses more; feathers are more resilient and don’t compress down as much (although they don’t retain their loft as well as down in the long term). Both can sleep warm … especially if you have a down comforter as well.
The fabric needs to have a tight enough weave so that any small feather quills don’t poke through the material and the down and feathers needs to be washed in production well enough that there are less issues with smell and allergies from dust mites. Some suppliers have return policies if you discover that you are allergic to their product but most allergies are not to the feathers themselves but to the byproducts of the dust mites that they can contain. An actual feather allergy can be tested with an allergy test.
Both can take some maintenance and need to be protected from any buildup of moisture (which can damage them quickly with mold and mildew) and body oils (which will damage them over a longer period of time). I would also suggest a separate cover that can help with feathers poking through and can also be removed and washed.
Overall they are more for “feel” and outside of cushioning pressure points don’t provide the same level of pressure relief as foams and aren’t nearly as “supportive”.
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With your describing your preferred comfort as “fluffy” and “nest-like”, going with a feather topper over your current dunlop mattress could solve the firmness situation you’re experiencing. You will definitely want to be sure that the manufacturer/ retailer offers an exchange/ return policy that gives you confidence to purchase from them . Looking forward to hearing what you decide and good luck.
Thanks,
Sensei