Ergonomic DesignThe office desk chair with an S-shaped ergonomic high back to accommodate the natural curvature of the spine, providing maximum support for your lumbar and shoulders. The mesh backrest is highly breathable and can be tilted 90°-135° for all-day sitting and relaxation. Adjustable Headrest & Lumbar SupportThe headrest of this ergonomic home office chair is adjustable in height and 45° angle to meet the needs of work and relaxation. The soft lumbar support can be adjusted up and down, front and back freely to fit the lumbar area more closely and relieve the fatigue of sitting for a long time. Comfortable Thick CushionThe padded cushion of this computer desk chair is made of high-density shaping foam. The thickened design reduces pressure on the hips and tailbone. Cushion size: 20.86'×20.66'.Designed to meet the needs of big and tall people. Liftable 2D armrests provide comfortable support for hands.