A chair has a material composition of teddy fabric cover, plywood, foam, and iron legs, with an internal frame made of plywood, internal seat material of foam, and internal backrest material of foam. It supports a maximum load bearing and features an assembly method where the seat, back, and legs are KD (knock-down). The height of the chair can be easily adjusted to suit different heights, and it can rotate 360 degrees, equipped with five durable casters that provide strong support and enable smooth movement. The cushion has a certain thickness, with the interior filled with high-density soft sponge that effectively relieves your body to ensure you don't get tired after sitting for a long time. It has a semi-wrapped backrest filled with high-density sponge, adopting an ergonomic design with a slightly inner arc curve that better fits your body, and is suitable for environments such as offices, study rooms, and bedrooms.