Our pillows are filled with Canadian-grown, organic buckwheat hulls that are sieved and cleaned with forced air to remove dust and other impurities. The pillows are made from non-dyed, organic cotton twill. The pillows are meticulously sewn and checked for quality in Toronto. Our high quality pillows feature a YKK invisible zipper and strong Gutermann thread from Germany. The buckwheat hulls in our pillows can be arranged and shaped to precisely suit your body's contours. A small zippered opening allows you to remove or add buckwheat to personalize your pillow. Each pillow comes with a 2 lb package of extra hulls. In addition to providing excellent body support, the buckwheat hulls allow air to flow through the pillow, keeping the pillow dry and fresh.