Slippers are made from Eco friendly unpainted wool. This natural fiber is is very breathable, soft and can make your feet feel always perfect. You can wear them not only in winter, but also in summer, because wool has a perfect attribute to keep your feet cool when the weather is hot, and warm when is cold. They are made using hot water and soap and it's one of the most sustainable processes in textile. Soles are covered with natural leather. Hand wash only.