How to choose a good office chair? Here are some ways.
A good office chair should have a proper lumbar support to help maintain disc pressure and back muscle exertion at low levels, particularly when the backrest is reclined from upright.
A good office chair should have adjustable armrests that provide a stable and comfortable support throughout a wide range of adjustment. They can be raised and lowered, pivoted in and out, or moved forward or backward accommodating several types of user size and body types.
A good office chair should have an adjustable seat pan depth that improves the support provided to larger users preventing smaller users from experiencing compression in the back of their knees.