Mouton Sheepskin refers to when the sheepskin has been processed to look like beaver or seal fur. Mouton is the French word for "sheep". Lambskin hair is straightened and treated chemically and thermally in order to produce a highly durable water repellant mouton finish. Often, Mouton is dyed brown to look like sheared beaver but it can be found in other colors as well. Mouton is extremely plush and it features a soft, velvet-like feel. It is widely used on Russian style hats and men's Cossack hats.