The gas lift of this Simple Gas Lift Swivel Leather Office Chair allows for easy adjustment of the chair's height. This is crucial for finding the perfect sitting position in relation to your desk. You can raise or lower the seat to ensure your feet rest flat on the floor and your arms are at a comfortable height on the desk. For example, if you have a taller desk, you can raise the chair to avoid hunching over, while a lower desk might require a lower seat height for proper ergonomics.