Yuko Shokai Co., Ltd.'s waist cushion, erinor. Purchased for around 4,500 yen as a measure against lower back pain, but only used a few times. Approximately 27cm (H) x 27cm (W) x 7cm (D). The exterior is a honeycomb mesh, and the interior is soft polymer (like sliced straws). It can be washed in a laundry net. It has a zipper, allowing you to remove the soft polymer and adjust the thickness.