This Buckwheat pillow is filled with 100% natural, organic, triple air cleaned flattened buckwheat hulls. Our Japanese Buckwheat Hull Pillows will fit the contours of your head and neck and give you the perfect amount of support. The buckwheat hulls allow air to circulate throughout the pillow. Cooling it off quickly. May relieve common sleeping problems such as; tension, muscle pain, stiff neck, headache and stress. They are made of 100% double cleaned buckwheat hulls - the preferred type of hulls for pillows. Will conform and adjust perfectly to your head, neck, and spine. Will NOT collapse like foam. This non-allergenic cervical roll made of all-natural buckwheat hulls comfortably molds to the contour of your body. It comfortably supports your head and keeps your spine correctly aligned. These contain no dangerous chemicals from fumigation. Faithful to Japanese tradition, the set features an inner case with a convenient 'hidden' zipper for adjusting the amount of buckwheat hulls used for filling to your personal comfort level. The outer sleeve is made of the same cotton fabric, and, like the inner case, is machine washable. (Buckwheat hulls are not washable.) .