[Big and Tall Ergonomic Chair - Adjustable Backrest Height] Load up to 300 lbs. The large office chair recommend for 5'.3" to 6'3" heavy People. It has a 2.4-inch (4 gears) height-adjustable backrest and 3-inch liftable headrest, The height from the cushion to the headrest is the lowest 26.58" and the highest 31.98" that is much comfortable for tall men. And 4” adjustable height seat suit your height and desk size. | [Ultimate Comfort for Body Needs-Fully Adjustable Desk Chairs] office chair Ergonomic for back pain, it has independent 4D lumbar support to accurately fit the natural curvature of your spine and relieve back pain. The backrest allows to tilt and lock at 90-135 ° ranges. The multi-dimensional free rotating headrest provides the most comfortable position for your neck. The seat goes up and down, lifting armrest for the ultimate in customized comfort in the office, or in front of your game! | [Reduce hip pressure - Premium Elastic Mesh Seat] SAMOFU mesh office chair with the waterfall-edged seat, their contoured and slightly downward sloped shape aids to relieve pressure and increase support...