Adjustable Backrest：This office chair features a three-position adjustable backrest.Easily adjust the height using the lift lever while remaining seated.Achieve the most comfortable position tailored to your height and body type. Breathable Mesh Cushion：This mesh office chair utilizes a special weaving technique that increases the elasticity of the mesh surface by 30%., evenly distributing pressure even during prolonged use to prevent sagging or deformation. Adjusting Lumbar Support:Dynamically adapts to your sitting posture to reduce lower back strain. Provides firm support when leaning forward for work, and automatically relieves pressure when reclining. 3D Adjustable Headrest：The ergonomic chair's headrest features three-way adjustment: vertical height, forward/backward position, and tilt angle.Perfect for users 5'3"-6'3" tilt forward for focused work. 3-Stage Recline Adjustment:With this ergonomic office chair, simply flip the adjustment lever on the right side with one hand to switch between 105°, 120°, and 135° recline angles.Suitable for long time work and relaxation.