Sustainabilty because of its quality
Sustainability becauses of its natural material
Sustainability becauses of its design
Pure wool has a natural self-purification:
It does not adopt any smell or rather the smell vanishes through airing.
Pure wool is able to adopt about 30% of its weight in dampness without feeling moist. This dampness is getting released very fast as well. Liquids, however, just roll off the surface.
It is also antistatic and therefore not appealing to dust. Dirt particles do not stick to the cave and hence they are easily to be removed.
Because of this positive features of your mopi - felted caves it is not necessary do wash it completely. Usually vacuuming, beating and airing is enough.
Nevertheless, mopi - felted caves may be washed at a wool setting up to 30°C.
Or just wash them by hands.
More features of pure wool:
Pure wool saves air and therefore, it warms the pets. It is breathable as well and balances their body temperature.