Would you prefer the qualities the X-5 offers, combined with a more active seat? Please consider the X-4. It has four legs and a static frame, automatically enhancing an active seat. The firm back of this slender conference chair and its armrests are not attached to each other, adding to its natural range of motion. Its strong four- legged base makes the X-4 easy to stack. It fits any desk as a temporary extra seat. The X-4 can also be linked in rows in an auditorium. The X-4, like the X-5, quite simply to be used anywhere where a chair is necessary!