Our clean room chairs have been tested to Fed Std.209E and ISO 14644-1 requirements (Class 100/ISO Class 5). Optional 6-way adjustable arm rests support a variety of arm placements for proper ergonomics. Additional ergonomic benefits include a contoured waterfall seat cushion and an adjustable back rest with lumbar support for increased comfort during extended sitting durations. Class 100 Clean Room chairs are constructed of highly durable molded polyurethane foam cushioning covered with easily cleaned antibacterial/antimicrobial vinyl available in over 65 standard and custom colors. Optional seat tilt provides 8 degrees forward and 3 degrees backward locking tilt for ergonomic posture support. These desk height chairs feature your choice of chrome-hooded casters or black glides on a polished cast aluminum base. Each ergonomic chair is backed by our 15-year warranty, lifetime on the pneumatic lift. Chairs shipping to California or Massachusetts may be subject to state mandated fire treatment and may be subject to an up-charge.