Adjustable height and width (2D) armrests for office chairs provide additional adjustment options to optimize ergonomics and comfort. Here are some features and benefits of 2D armrests:

1. Height adjustment : Similar to 1D armrests, users can adjust the height of the armrests to ensure that their forearms are parallel to the ground and at a 90-degree angle with the upper arms. This helps reduce fatigue and tension in the arms and shoulders.
2. Width adjustment : With the ability to adjust the width of the armrests, users can adjust the distance between their arms to suit their body shape and preference. This provides comfortable support for the arms, regardless of the width of the user.
3. Customization : The ability to adjust both the height and width of the armrests makes it possible to adapt the chair to the individual needs and preferences of the user. This contributes to an ergonomic working position and increases comfort during prolonged sitting.
4. Accessibility : The height and width settings of the armrests are usually easily accessible and can be adjusted while the user is sitting in the chair. This makes it easy to adjust the chair to changing needs during the day.

All in all, 2D armrests provide a versatile and customizable solution for improving the ergonomics and comfort of office chairs. With both height and width adjustments, users can create a comfortable and supportive work environment to suit their individual needs.