The Alera office chair has a classic design that will perfectly complement any home, office or conference room. Functionally, it is a pleasure to sit in as the durable ribbed vinyl back provides natural posture support. The seat cushion and arms are padded, while the form of the armrests were intended to maximize a 90 degree wrist angling for typing. Alera office chair's chrome-plated aluminum base is fitted with five dual-wheel casters, while a tension knob and tilt lock allow for easy back position adjustments.