It is a shiki-buton which became hard and flat like a senbei (a Japanese rice cracker). That’s why it is called senbei-buton. A wa-futon made of cotton tends to become a senbei-buton, because the cotton fibers get entangled after absorbing moisture.
It is a shiki-buton which became hard and flat like a senbei (a Japanese rice cracker). That’s why it is called senbei-buton. A wa-futon made of cotton tends to become a senbei-buton, because the cotton fibers get entangled after absorbing moisture.