We actually sell yurts that are made of almost 100% natural material. Our cotton based canvas is of very good quality and is water resistant. In certain cases of prolonged rains or long lasting melting snow, you might experience some humid spots here and there. Although not always 100% natural, here are a few ways to adapt your yurt to extreme humid conditions: In general, we strongly recommend placing a layer of house wrap (We use a combination of Mento 1000 on the roof and Tyvek on the walls. Ask us about our Mento Exclusive) between the felt and the outside cover on the roof and walls. These house wraps are not organic, but TYVEK for example claims to be completely biodegradable. You can also purchase a house wrap directly with your new yurt. If you’re not using the above-mentioned wrapping and see humid spots after heavy rains, heat the yurt for 30 min with a good wood fire in the stove. Waterproof the seams (or even the whole outside cover) regularly, every year for example. Especially in cold winter climates, ventilation is crucial as excess of humidity can build up under the cold surface of the house wrap.