Retail Price: ¥3999 Top Highlights Brand: HOMCA Features: Breathable, Elastic, Non-slip Size: 45 x 38 x 7.1 cm Material: Memory Foam Shape: Donut-shaped [Ergonomic Design] The HOMCA ergonomic seat cushion offers three different contour designs. The hollowed-out edge prevents direct pressure on the tailbone. The hollow design lifts the body and maintains a healthy sitting posture. Front: The recessed design relaxes the legs. It maintains an ideal sitting posture for long periods without causing discomfort to the back or lower body. [High-Quality Memory Foam] The seat cushion uses high-density, elastic, high-quality memory foam to firmly support the lower back. It resists sinking even after prolonged use and maintains its softness. The posture correction cushion is heat-sensitive and adapts to the body's curves. It provides the necessary comfort for long hours of sitting in the office. [Multi-Situation Support] Working on a hard chair can be difficult if you have tailbone pain or hemorrhoids. This cushion can be used not only on hard chairs at home or in the office, but also in cyber-sports chairs, cars, and by postpartum pregnant women. Wherever you sit, this cushion will provide amazing comfort for your back, lower back, and thighs. [High-Quality Materials] The cushion weighs 0.93kg and measures 45*38*7cm, with a non-slip bottom. The round seat cushion has a breathable mesh cover for a comfortable and cool sitting experience. The cover is removable and machine washable. Please remove the pillow cover when washing. I'm giving this away because I haven't used it and it's just taking up space.