Installation Video Available We provide an installation video on this product page to help you. You can see all steps of assembling in the second half of the video. If you have any other installation problem, please get back to us at any time. Mesh office chair dimension All dimensions are measured manually, these may have deviation range around 1 inch. If by any chance they are not the same as your measure, we are sorry for that. Overall height ( top to the floor): 34.3"- 38.2"(87-97cm) Height from seat to floor: 15.7 - 19.7" (40-50cm) Adjustable height: 4" (10cm) Chair back size (width x height): 18.3" x 18.9" (46.5x48cm) Chair seat size (width x depth): 20.1" x 19.7"(51x50cm) Chair seat thickness: 3.1" (8cm) Arm height from floor: 23.2"-27.2" (59-69cm) 360° Swivel & Flip Up Armrest The fluid 360° swivel enhanced convenience and comfort during work. Fold up the armrests when not in use and slides this office chair under the desk for space-saving. Height Adjustable Height adjustment range: 4''/10 cm.Lowest seat height to floor: 15.7''/40cmHighest seat height to floor: 19.7''/50cm Customize your position with the adjustable height mechanism, and find the perfect vantage point for your daily work experience. Rocking Mechanism The seat back can slightly tilt about 30 degrees (can’t lock the angle) when you lean back and it springs back after you sit up. To activate the rocking mechanism: Turn the tilt tension knob underneath the seat to make rocking easier.Pull out the lever to activate the rocking mechanism. 360° SWIVEL CASTERS The durable and flexible casters provide great mobility on any surface, never scratch the floor, smoothing and no noise. High Resilience Foam Cushion Long lifespan, non-deformation, more comfortable. Comfortable and thicken padded seat cushion offers for all-day comfort. Compared with the low cost chip foam cushion, our high resilience foam cushion is more comfortable and durable that built to last. High Density Mesh American-made mesh;Breathable, durable, not easy to deform Black mesh covers both the padded seat and the chair back. This superior quality mesh offers good breathability, comforts and enhance the back support which is not easy to deform. Ergonomic Design Mesh Office Chair Adjustable padded lumbar support Adjustable range: 1.97" (5 cm)Padding thickness: 1.8" (4.5 cm) The office chair features with adjustable lumbar support that can meet the needs of most people. The lumbar support padded with a sponge for good back support to reduce back pain. Supports up to 300 lbs Built to be long-lasting and comfortable, our mesh office chair can support up to 300 pounds, that can satisfied most people needs. High Quality Gas Lift Cylinder Selected superior material, durable, more solid and safer, strong load-bearing capacity. Flip-up Armrests, Space-saving When the office chair is not in use, you can fold the armrests up and slide it under the desk, quite flexible and space-saving. Removable Armrests The armrests can be removed easily, changing the chair into an armless chair in seconds whenever you want.