Humanscale Diffrient Smart Desk Chair - Home Office Desk Task Chair with Adjustable Duron Arms - Black Frame - Amber Monofilament Stripe Back Mesh - Black Vellum Seat - Soft Hard Floor Casters NEW Diffrient Smart Chair S113 with Adjustable Duron Arms Self-adjusting recline - Intelligent counter-balance recline mechanism automatically provides the right amount of support through the full range of recline motion, regardless of user size and weight. Pivoting Backrest - Extra motion of the backrest during recline automatically adjusts to the changing needs of the spine. Form-sensing mesh back - Tri-panel, non-stretch mesh construction creates body-fitting contours and self-adjusting lumbar support for a customized fit Consistent support. Whether you lean forward or recline, your lower back support remains constant--no adjustments needed; users of all sizes can easily assume and maintain a reclined position.