※ Although the outer box is not available, it is unused. Reference price online: ¥3999 Top Highlights Brand: HOMCA Features: Breathable, Elastic, Non-slip Color: Black Size: 45 x 38 x 7.1 cm Material: Memory foam Shape: Donut-shaped [Ergonomic Design] The HOMCA ergonomic seat cushion is available in three different contour designs. The hollowed-out edges prevent 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 in 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 is resistant to sinking even after prolonged use and maintains its softness. The posture correction cushion is heat-resistant and adapts to the body's curves by sensing body temperature. It provides the comfort needed for sitting at a desk 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, in 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 0.93 kg 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 pillowcase when washing.