Armrest height is one of the most common ergonomic chair adjustments. The armrest adjustment can help with upper back. This is usually controlled by a push of a button or a simple knob, allowing to tilt the armrests inwards or outwards to varying degrees until it is adjusted to a comfortable position. The chairs’ armrest are adjustable in 1D, 2D, 3D and 4D which allows sitting close and working with arms relaxed.