All-Natural Buckwheat Hull Filling: Our pillow is filled with premium buckwheat hulls, which conform to the shape of your head and neck, providing optimal support and alignment. Adjustable Loft: Customize the pillow's loft to your liking by adding or removing buckwheat hulls through the convenient zippered opening. Hypoallergenic and Eco-Friendly: SobaMakura Buckwheat Pillows are naturally hypoallergenic, making them an excellent choice for allergy sufferers. Temperature Regulation: The buckwheat hulls in our pillow promote breathability, preventing heat retention and helping regulate your body temperature for a cool and comfortable night's sleep. Durability and Longevity: Unlike traditional pillows that lose their shape over time, our buckwheat pillows are built to last.