Buckwheat and millet hull pillows have been around for centuries and used both in Asia and Europe. Recommended by chiropractors to maintain proper spinal alignment during sleep while keeping you comfortable and your muscles fully relaxed. Hulls shift and adjust to cradle your head and neck with perfect pressure-relieving, passive support, even as you shift positions during sleep. They are the natural choice for healthy, restorative and ergonomically correct sleep. Hulls are a far superior filling to polyester or foam. Bucky uses only premium and natural hulls and best of all they are hypoallergenic. Filling does not bunch or clump and lasts for years.