Oversize U-shaped cushioning on the 25 x 20 in seat and 23 x 14 in backrest supports different postures for home office or makeup use. The ergonomic backrest shape helps maintain support whether you lean back or sit upright. A 100°-120° rocking mechanism with adjustable rocking tension lets you fine-tune how easily the chair rocks for more active sitting. The gas cylinder adjusts seat height from 19-22 in to align with different desk heights. A heavy-duty metal base supports up to 330 lbs, while the 360° swivel, smooth rolling casters, and armless design help you move easily and tuck the chair under tables to save space. Easy-to-clean PU leather upholstery simplifies care after daily use.