Austin Horn Classics DuPont Sorona Down Alternative Sleeping Pillow, Standard, Off-White Pillow: 100% Sateen Cotton; Cover: 60% Silk, 40% Cotton Imported Elite down alternative pillow by Austin horn is filled by DuPont Sorona fiber mixed with pearl fiber Sorona is derived in part from annually renewable plant based ingredients (corn) It has 500 thread count, 100-percent sateen cotton fabric and has 1-inch gusset and matching color self welt With optional "removable and zippered" stripe protector cover is silk/cotton with amazing feel and machine washable Both pillow and silk/cotton protector cover are machine washable; do not mix colors