Wool consists of the hairs from the fleece of the sheep Ovis aries. The hairs are coated with wool fat. It is removed by kneading in water, where the fat gets emulsified with water. This process also helps in washing other impurities.

It is marketed as yellowish-white, continuous, slightly twisted and coherent pieces. It is highly hygroscopic and can absorb 50% of its weight of water.

Uses: Wool is used in chiropody (treatment of the feet). Since it adheres strongly to lesions, it should not be directly applied to open wounds.