Premium buckwheat hulls. Hypoallergenic, triple-cleaned, and pesticide-free. The original Buckwheat Hull Buckwheat hulls have been used for centuries as a fill for all types of pillows and cushions. They are natural, eco-friendly, do not compress over time, and distrbute weight evenly; alleviating pressure points. These triangular-shaped hulls grip together; providing passive, comfortable, and stable support. They also allow ventilation to maintain a dry pillow all night, and keep you cool in the process. We invite you to treat yourself to the best, so choose a natural hull filling over anything synthetic.