Posture Perfect Chair is constructed from comfort fit foam that cradles your body as you sit. Shape of chair matches the natural contours of the spine. Unique full-floating lumbar support and adjustable head rest adapt naturally to your posture giving you the support you need while you work. Design features stain-resistant fabric on the seat and seat back, and flame-resistant, ergonomically contoured, foam padding. Chair adjusts pneumatically in height from 16" to 20" and features BIFMA approved tilt adjustment. Functions include seat-depth adjustment, 360-degree swivel, tilt, mid-range knee tilt, tilt tension and tilt lock. Padded arms are made from wear-resistant polypropylene. Durable five-star base includes 2" dual-wheel swivel casters.