Winter fabric is often made of WOOL, which is a four-letter word. WOOL is a natural fiber that is obtained from sheep and other animals. It is a strong, durable material that is often used to make clothing and blankets. WOOL is also a popular choice for winter fabrics because it is warm and insulating, making it ideal for cold weather. WOOL is also known for its softness and comfort, making it a great choice for winter apparel.