I have a wool filled duvet - likely heavier than a similar warmth of down, but it's awesome.
Traditionally, mattresses like that would have been flipped over monthly, and "aired" daily by pulling back the blankets to the foot of the bed for a couple of hours after you get up. Being in a humid environment, I not only pull the blankets back, but I point the dehumidifier output at our current mattress and turn it on for an hour or two. It makes a huge difference.
Burra wrote:
He said at least ten years.
I suspect that like many locally made, natural fiber mattresses, at that point it would be taken apart and refilled so long as the fabric cover was in decent shape. The all natural insides would then be recycled to other tasks like mulching plants. I have read about a small business in Mexico that goes from village to village on a route "rebuilding" mattresses - I think those ones had springs in them, as well as fiber, but it's been a while.
Our current North American system is hugely wasteful - I'm not sure how much natural mattresses are even available if you do try to buy them. This is definitely an area where permification is in order.