The shoe is made of natural sheep´s wool. Wool is the perfect material for indoor shoe. Your feet never feels too hot or too cold. The shoe has a double sole of felt that make it extra comfortable and pleasant. The outer sole is made mainly of natural rubber. The sole is waterproof and non-slip. Vacuum your Egos slippers to remove any dust or dirt. They can then also be washed with wool soap by hand in water no more than 30 degrees. After the shoe has been washed, the wet shoe is placed on the foot and pressed in to shape so that it retakes to the shape of the foot. Then remove the shoe and set to dry naturally away from direct sunlight and any other heat source.