Characteristics of Wool Fabric
Wool grows in several natural colors such as black, brown, grey and the most commonly available, white. Wool of any color takes dye easily and can be felted. Wool straight from a sheep is highly water-resistant. It is said to be "in the grease", the grease being lanolin, and can be worked into yarn and knit into water-resistant mittens. This fabric retains heat better than other fabrics when wet.
In addition to clothing, wool has been used for carpeting, felting, and padding. Wool is used to absorb odors and noise in heavy machinery and stereo speakers. Ancient Greeks lined their helmets with felt and Roman legionnaires used breastplates made of wool felt.