Sofia Adjustable Lumbar Operators ChairSofia Adjustable Lumbar Operators Chair Supreme comfort and classic design come together in the Sofia operators chair. With a pneumatic lumbar pad for ultimate comfort and a waterfall seat to reduce stress on the users knees by having a downward slope at the edge of the seat cushion, Sofia will help you through those long hours working at the office. Back rake and back height adjustment Black nylon 5 star base with easy glide castors Gas height