DXRacer Drifting Series can be locked in an upright position and the arm rests can be adjusted in to eight positionsThe backrest is fully adjustable btween 90 and 135 degrees The headrest and lumbar cushions are included to all for certain customization on comfortThe star base and the SGS certified gas lift holds weights up to 100kg approx 220 pounds and the 2 PU-casters rolls smoothly over flat surfaces