It is a pillow filled with buckwheat hulls. Soba noodles made with buckwheat flour are popular in Japan. Buckwheat hulls are generated from the process of making buckwheat flour and originally supposed to be dumped. The pillow filled with the buckwheat hulls hardly retains heat, absorbs moisture well and adapts to whatever shapes you like. Each time you move the head, the pillow makes a crackly sound, which seems not to be a noisy sound but a favorable sound for Japanese. On the other hand, there are bad things that the pillow tends to be infested with insects and people who have soba allergies can’t use it.