Quilts are made of cloth, which is woven from fibers. Those most commonly found in quilts are natural fibers derived from plants, animals, protein, or vegetable: cotton, linen, wool, silk, and rayon. Although there are other types of synthetic materials, they are not as common in quilts nor are they subject to the same types of deterioration. Natural fibers have a limited life expectancy. To delay the deterioration process and extend the longevity of these materials, there are suggested methods of care and conservation.