Input (grade 4): In the Kyoto area, tatami generally measure .955 m by 1.91 m. Tatami of this size are referred to as KyÅ ma tatami.
Output (grade 8): They were knitted and became thicker like modern tatami. People who lived in the Heian Era stepped onto tatami to show their power and they spread the tatami only in a necessary part of the room.