Boiled wool is a special type of wool that is felted and knitted. The knitted wool is boiled in water mixed with an alkaline solution. This causes the fibers to stick together resulting in a denser material. It is durable and great for holding in heat! It also water and wind resistant! Boiled wool is primarily used for coats, jackets, scarves, and vests. This fabric has a four-way stretch. Lining is recommended for this fabric to give it a softer feel on the skin!