These vinyl upholstered chairs adjust to fit most body types and workstations. 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. Vinyl chairs are constructed of highly durable molded polyurethane foam cushioning covered with easily cleaned antibacterial or antimicrobial vinyl in over 65 standard and custom colors. Optional seat tilt provides 8 forward and 3 backward locking tilt for ergonomic posture support. Foot rings are in nylon reinforced fiberglass . These high bench height chairs feature your choice of casters or glides on a nylon reinforced fiberglass base.