Ergonomic Lumbar Support:This office chair features a height and depth adjustable lumbar support to gently cradle your lower back and help you maintain a comfortable posture for long hours of work. It also has an S-shaped ergonomic backrest that aligns with your spine and reduces pressure and muscle fatigue. Adjustable Comfort: Engineered for all-day comfort,The chair offers adjustable features such as 2" height-adjustable and 1.2" depth-adjustable lumbar support, 360° swivel seat, 4" seat height adjustment, 90°-125° tilt/rocking function with tilt lock,ensuring a customized fit for various sitting positions and body types. Flip-up armrests provide extra space when neededideal for compact workstations or easy storage. Comfortable and Breathable Cushion:The U-shaped seat cushion filled with high-density foam and pocket springs conforms to your body and relieves pressure on your thighs and hips,providing ultimate comfort for extended sitting periods.The large 20.8"