Our Aeron Chairs are sourced from Herman Miller Enthusiasts and Renewed to maintain the authenticity of the masterful materials, delicate engineering, and accurate calibration Upgrade your office, home office or workspace decor with a design that’s an instant classic, featured in the permanent design collection of the Museum of Modern Art in New York. Unquestionably more comfortable, more encouraging of good posture, The Aeron Chair embodies the modern prospects for ergonomic and comfort. Suspension seating with full ergonomic support. Kinemat Knee-Tilt Mechanism Tilt Lock. Height Adjustable Lumbar Support. Size A: H 38.5″ max W 25.75″ D 25.75″ Seat H 15″-19″ Recommended if you are: 4’10”-5’9 Tall, 90-150 lbs. Size B: H 41.25″ max W 27″ D 27″ Seat H 16″-20.5″ Recommended if you are: 5’2″-6’6 Tall, 130-325 lbs. Size C: H 43″ max W 28.25″ D 28.25″ Seat H 16″-20.5″ Recommended if you are: 5’3″-6’6 Tall, 180-350 lbs. 8Z PellicleT elastomeric suspension seat and backrest; seat tilt mechanism; adjustable back with PostureFit SLT hardware; powder-coated or polished die-cast aluminum frame and base; standard or leather-upholstered polyurethane foam arm pads; standard 2.5-inch black nylon carpet casters.