Size details: the buckwheat pillows mentioned on the detail page can be adjusted by approx. 1 to 2 inches. 100% Checkered Buckwheat Hulls - Buckwheat is divided into common buckwheat and tartary buckwheat. The Tartary Buckwheat of the Lofe adjustable buckwheat pillow helps relieve fatigue and tension and ensures that you sleep more peacefully. Our buckwheat pillow, filled with tartary buckwheat husks, can relax your neck. We choose and use high quality tartary buckwheat husks that have been treated with high temperature. ADJUSTABLE HEIGHT The side zipper provides a convenient way to add or remove buckwheat filling and adjust the height of the buckwheat pillow to your taste. EXCELLENT SUPPORT Buckwheat husks provide adjustable support for the head and neck to ensure maximum comfort. The buckwheat pillow helps relieve fatigue and tension and ensures that you sleep more peacefully. BUCKWROAT KEEPS YOUR HEAD COOL: Our adjustable buckwheat cushion repels heat and allow air flow between the sleeves. Buckwheat Pillow Features: 1. The firmness ensures good support for your neck. 2. A slight noise when moving the head, the buckwheat hulls have liquid so that air can flow to keep your head cool. 3. A slight smell that is the natural scent of buckwheat husks. Don't worry, sleeping on your adjustable buckwheat pillow is immediately safe.