Award-winning industrial designers Bill Stumpf and Don Chadwick earned themselves a place in what amounts to the design hall of fame when their Aeron Chair (1994) was added to the permanent collection of MoMA. Aeron is the paradigm of ergonomic seating, conceived to conform not only to different body shapes but also to movement, with multiple adjustment points for a custom fit. The breakthrough Kinemat tilt mechanism lets it move smoothly with the user from forward tilt (when you reach for the phone) to backward recline (while you contemplate what to say). And the Pellicle weave upholstery, another innovation in concept and comfort, evenly distributes weight over the seat and back, and permits air circulation. Durable and sleek, this chair will still look like new long after you retire. The Upgraded Aeron® Chair: features a tilt limiter with tension control, seat angle adjustment, fully adjustable standard arms and arm pads, Adjustable PostureFit SL Support, and Hard Floor or Carpet Roll-Away Resistant Casters with Quiet Roll Technology. The Basic Aeron® Chair: features a stand tilt limiter, fixed arms, zonal back support, and Hard Floor or Carpet Roll-Away Resistant Casters with Quiet Roll Technology Through hundreds of samples, tests, and iterations, Herman Miller arrived at three tightly curated, holistic material expressions: Graphite is the darkest, a modern rendition of the original Aeron Carbon offers a balanced neutral that works equally well in warm and cool environments Mineral is the lightest, ideal for today’s more open office environments Size Small (A) Height: 38.5 inch Width: 25.75 inch Seat Depth: 16 inch Medium (B) Height: 41 inch Width: 27 inch Seat Depth: 16.75 inch Large (C) Height: 43 inch Width: 28.25 inch Seat Depth: 18.5 inch Seat Height Low-height cylinder: 14.8 - 19.7 inch Standard-height cylinder: 16.4 - 20.8 inch High-height cylinder: 17.4 - 22.8 inch Notes 39% recycled content, 91% recyclable GREENGUARD® Certified MBDC Cradle to Cradle® Silver certified Designed by Bill Stumpf and Don Chadwick in 1994, Remastered by Don Chadwick in 2016 Sizes A and B are shipped ready to assemble, size C is shipped fully assembled Warranty: 12 years Made in the USA There is a 4 to 8 week lead time delivery for all custom made Herman Miller orders. All Herman Miller products are generally delivered directly from Herman Miller’s manufacturing facility. All Herman Miller products, are made-to-order and therefore are non-refundable, cannot be changed, returned and/or cancelled.