Organic Buckwheat Hull/Millet Hull Duplex Pillow - King size (20" x 33") We use only certified organic hulls, grown and harvested in the United States. Our 100% cotton casings are zippered; you can remove hulls to adjust the height of your pillow. We overstuff all our pillows to ensure proper height (5"-6") for all our customers. Each pillow comes with a free cover. Hypo-allergenic filling. Our hulls are grown without any pesticides or fumigation chemicals.