Curved foam back offers full contact and comfort for up to 8 hours and by users up to 115 kg. Inflatable lumbar pump to support the lower back. Backrest can be raised or lowered. Backrest angle can be fixed or set to free float with the user. 5 star, height adjustable, swivel base with castors. Height adjustable arms with soft touch finish. Suitable for up to 8 hours use. 2 year guarantee.