LANGRIA Mid-Back Mesh Computer Desk Chair Executive Adjustable Swivel Office Chair Ergonomic Design, Adjustable Height and Armrests Cotton Padded Seat,LROC-088BK, Black MADE TO LAST MATERIAL: constructed with 1 breathable Korean mesh and premium PP backrest, 1 contoured cotton seat pan, 2 padded adjustable armrests, 1 heavy-duty nylon base with 5 easy moving nylon wheels FLEXIBLE AND CONVENIENT: fully adjustable height with a 360-degree swivel offer a versatile range of motion; this chair is also equipped with a pneumatic gas lift system for you to easily adjust the height of the seat (flip the lever up) SYNCHRO TILT MECHANISM: this mesh office chair features a synchro tilt mechanism, you can turn the knob clockwise to get a higher or lower position among 90, 101.5and 113and then lock for a desired backrest with great comfort EXCELLENT ERGONOMIC DESIGN: the curved contours are designed to give optimal lumbar support and to support your body while keeping your spine properly aligned; adjustable tilt tension accommodates all different size users HIGH QUALITY GUARANTEED: LANGRIAs office chair meets BIFMA standards and supports up to 305lbs of evenly distributed weight, its explosion-proof base plate with sturdy legs increase safety and stability