Hi JaiRo,
Congratulations on ordering your new mattress! 
As you’re already aware, you certainly chose a product that uses very high quality materials.
I’m glad you were able to speak more with Dan from TMASC and come up with a decision. The Malmo certainly is a nice mattress.
Regarding the duvet, you may wish to look near the end of the component supplier list in post #4 here or also look at some of the natural fiber members and suppliers in post #3 here.
I’m looking forward to your updates on your mattress once you’ve had a chance to sleep upon it for a while.
Phoenix