These clean room chairs have been tested to Fed Std.209E and ISO 14644-1 requirements (Class 10 or ISO Class 4). Ergonomic benefits include an adjustable back rest with lumbar support for increased comfort during extended sitting durations, contoured waterfall design, over 65 antimicrobial or antibacterial standard and custom vinyl color configurations, and molded polyurethane cushioning. The 5-leg polished cast aluminum base prevents tipping, and is designed specifically for use in clean room environments. These bases can be fitted with non-marring chrome hooded casters, or non-marring bell glides.