Our ergonomic fabric stools adjust to fit most body types and workstations. The upholstered cushion includes highly durable moulded polyurethane foam. Additional ergonomic benefits include an adjustable back rest with lumbar support for increased comfort during extended sitting durations. Optional seat tilt provides 8? forward and 3? backward locking tilt for ergonomic posture support. Foot rings are available in 18 ?-inch diameter, black, nylon-reinforced fibreglass or 20-inch diameter chrome. These high bench height stools feature several customizable options, including casters or glides on a nylon-reinforced fibreglass base, and five standard colour configurations. Each ergonomic stool is backed by our 15-year warranty, lifetime on the pneumatic lift. Our upholstery consists of 100% olefin fabric. Chairs shipping to California or Massachusetts may be subject to state mandated fire treatment and may be subject to an up-charge.