Don Chadwick, a pioneer of ergonomic design, created a chair that marries the best of his thinking with the finest principles of Knoll design. From its streamlined form to its smart engineering, Chadwick is the office chair refined — and redefined. It responds to your body"s movements throughout the day with energizing comfort and a supportive ride. Features: ACTIVE SUSPENSION Couples a unique synchronized recline with a proprietary suspension fabric. BUILT-IN VARIABLE SEAT DEPTH Automatically expands based on seated weight without adjustment. BUILT-IN FORWARD TILT Automatically follows and supports user in forward and perching postures without adjustment. AMPLE LUMBAR CURVATURE Ensures all day comfort (additional lumbar support sold separately, see accessories below) STRAIGHTFORWARD ADJUSTMENT CONTROLS Seat height and tension knob are within easy reach. This chair has been tested and is approved for use by individuals weighing up to 300 pounds. This chair is warranted for 12 years, 24-hour, 7 days a week, multi shift use. BIFMA level 3 certified. Rated Sustainable Gold under the SMaRT Consensus Sustainable Product Standard. GREENGUARD and GREENGUARD Gold Certified. Environmental Certification BIFMA level® 3 certified. Rated Sustainable Gold under the SMaRT© Consensus Sustainable Product Standard. GREENGUARD and GREENGUARD Gold Certified. Can contribute to U.S. Green Building Council LEED® credits. Sustainable Design Manufactured in East Greenville, PA using clean technologies at the Knoll LEED® Gold and ISO 14001 Certified Lubin Building. Uses minimum materials in construction and designed for ease of disassembly. Designed for ease of disassembly, such that worn parts can be removed and replaced easily. Made with 35% recycled content and 42% readily recyclable parts. Foam and glue used are VOC-free.