Strong enough to support up to 450 pounds of weight, the Alera Merix Series Mesh Big/Tall Mid-Back Swivel/Tilt Chair - Black is a durable seating solution designed to meet the needs of users of all shapes and sizes. The mesh back and seat provide ventilation, making it more comfortable to sit in hot, stuffy offices. Extra support in the lumbar region helps to reduce back pain, and the padded arms are removable to provide more room as needed. Heavy-duty caster wheels allow the chair to be easily moved.