The SIHOO M57 Ergonomic Office Chair is a modern and stylish office chair designed for maximum comfort and support. Made with a combination of mesh, metal, and aluminium, this chair features adjustable lumbar support and a high back design to promote good posture while sitting for long hours. The chair also includes a swivel feature for added flexibility, and has a maximum weight capacity of 300 lbs. Its sleek grey and black finish, along with its powder-coated frame, adds a touch of sophistication to any office space. With self-assembly required, this chair is easy to set up and provides a comfortable and ergonomic seating experience for users.