Aeron chair size (B) fully loaded with all adjustments by Herman Miller. It’s the best and most admired and recognized ergonomic office chair ever made. Its innovative design and support for a range of postures, activities, and body types, have made and kept Aeron an icon. Combining a deep knowledge of human-centered design with cutting-edge technology, the chair is engineered with state-of-the-art adjustability, to help you maintain the optimal seating posture. Breathable fabric adapts to everybody and keeps you cool and comfortable. Pellicle mesh fabric, carbon classic weave seat and back. Adjustable seat height from 16″ to 20.5″. Adjustable lumbar support stabilizes the base of the spine. Black leather arm pads, height and pivot adjustable allow for a custom fit. Adjustable tilt tension, limiter and upright back lock. Medium chair size: B. Aluminum frame and base in graphite color. Weight capacity: 350 lbs. Designed by: Don Chadwick and Bill Stumpf. Overall Dimensions: Height 41″ x Width 27″ x Depth 16.75″ x Base diameter 26.5″ x Weight 41 lbs. Box dimensions: Height 40.5″ x Width 30″ x Depth 27 x Weight approx. I took one out of the box just to photograph and I put it back after (see the photos please). I recommend that you look up “uship. Com” or “plycongroup. Com”.