2D, 3D and 4D are an example of some nifty jargon that you see in the Ergonomic Office Chair world but it is often not explained which makes the constant reference to it quite unhelpful.
It simply refers to the number of dimensions in which the armrest can be adjusted. As a general rule of thumb, provided the build quality is good, the greater the adjustability the better.
So when we are looking at a 4D armrest, the adjustments which will be available are height, pivot or rotation inwards or outwards, adjustment in or out from the body (to increase or decrease the width) and forward and back. If you are looking for a chair with 4D capability then the V1 is ideal.
In our view most users will get more than enough performance for their needs from a 3D armrest, as the forward and back adjustment in our view is of limited appeal to most, provided that the chair is otherwise set up well. The M57 is an excellent example of a chair with brilliant 3D armrests.
When it gets to 2D it is actually quite important to double check which of the two dimensions of adjustment are being offered so that you in fact get what you think you need.
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