The Ergohuman Xtreme Executive Chair seamlessly merges aesthetics, form and function for a sleek, powerful product of generations of development and refinement. Use a single mechanism for simpler tilt lock, seat-height adjustment from 20" to 23-3/5" and seat-depth adjustment. Other functions include synchro-tilt with seat slider, adjustable back height and six-way dynamic lumbar panel. Tall, curved mesh back and lumbar support relieve the back pain caused by long hours of sitting. Mesh seat measures 19-7/10" wide x 15-1/2" to 17" deep. Mesh back size is 20-3/10" wide x 21-7/10" to 23-1/5" high.