Ergonomic bliss. The Aeron Office Chair - Size B, Graphite by Herman Miller features breathable 8Z Pellicle suspension seat and back which create 8 zones of varying tension. Its PostureFit SL technology allows you to sit chest open, shoulders back and pelvis tilted slightly forward. The chair is completed with adjustable pads which provide lumbar support for the spine. Choose the configuration that fits you and your body best.