LANGRIA Mid-Back Mesh Swivel Chair Home Office Computer Desk Chair, Ergonomic Design, Mesh Upholstered Seat Pan, Knee Tilt Mechanism, Max 285lbs, Black Back, LROC-060BK MADE TO LAST MATERIAL: constructed with 1 breathable Korean mesh and premium PP backrest, 1 mesh upholstered seat pan, 2 padded armrests, 1 heavy-duty nylon base with 5 easy moving nylon casters FLEXIBLE AND CONVENIENT: fully adjustable height with a 360-degree swivel offer a versatile range of motion; a pneumatic gas lift system that can easily flips the lever up is for you to adjust the height of the seat KNEE-TILT MECHANISM: locks your mesh desk chair in an upright position at 90 by pushing the lever in, and you can pull the lever out to unlock and recline from 90 degree to 110 degree that supports the body's' nature movement 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 mesh desk chair meets BIFMA standards and supports up to 285lbs of evenly distributed weight, its explosion-proof base plate with sturdy legs increase safety and stability