Seat back features a new Resilience™ fabric in black. Passive hip-pivot ergonomics, tilt motion for exceptional comfort and design ingenuity. Seat remains stationary while the back adapts to your body movement. Tilt lock control. 100% polyester upholstery with stain-resistant protection. Titanium metal base. Meets or exceeds ANSI/BIFMA standards. Pneumatic seat height adjustment. 360° swivel. Seat: 20-1/2w x 17-3/4d. Optional Arms sold and shipped separately.