Sihoo Doro C300 Ergonomic Office Chair with FootrestAdaptive lumbar cushion: Automatically adjusts to various sitting and reclining positions, ensuring consistent support at all times. 3D mechanical headrest: Wide and adjustable in multiple directions, providing tailored support for different sizes and postures. 4D armrests: Adjustable in height, depth, width, and rotation, they provide arm support in all sitting positions and move in sync with the seat recline. Waterfall seat design: Increases contact