Spectrum 2 Chair, height adjustable, High Back Chair - BLACK This chair has a supportive high back backrest with a powerful lumbar are.a The backrest combines a soft surface feel with powerful lumbar and upper back support. The chair has a rugged 2 lever control featuring separate adjustments for gas lift, height and backrest angle. A floating back support mode can be selected for the chair and can be locked at any angle. Comes with a contoured seat providing comfort and support Backrest Height: 460mm Seat Depth: 480mm Seat Width 470mm Recommended maximum user weight 140kg