Humanscale Freedom Task Chair: Standard Duron Arms - Standard Foam Seat Pan - Standard 5" Cylinder - Standard Carpet Casters Freedoms body-fitting contours ensure the user sits in comfort all day long Modular design allows the user to update the aesthetic of the chair and offers easy maintenance Synchronous arms allow effortless adjustment with one hand and our unique arm design attaches to the backrest to move with the user Pivoting backrest automatically moves with the user throughout the day and offers perfect lumbar comfort in all positions Distinctive design sets it apart from other task chairs and enhances any space