Cotton outer fabric. 100% siliconized air fiber inner filling (hollow fiber). The edges are piping. To prevent internal fiber loss, the quilt fabric is supported with interlining. Washable and vacuumable. It is made of optical white, gaza, calender and mercerized. All white fabrics have gone through the peroxide bleaching process. Sanforizing process is available on all our fabrics. Shrinkage after sanforizing is around 2%-3%. If the instructions for use are followed, the product will not turn yellow until the end of its economic life.