Real wool fabric is made from the hairy coats of sheep. Acrylic fibers are synthetic fibers made from the polymer polyacrylonitrile. Fabric made from light weight (less than 13 oz.) acrylic fibers sometimes has problems with tiny little balls of thread forming where the fabric has friction sometimes called “pilling”). On the other hand, moths love to eat wool, but will not eat acrylic. There are many pros and cons to both fabrics. Wool and acrylic receive dye and reflect light differently, and feel, fold, and wrinkle differently. Wool tends to be more pastel and muted. Heavy acrylic can last forever. For a more in depth answer, read our post on the difference between acrylic and wool.