LANGRIA Big and Tall Office Chair Executive Chair with Padded Arms, High-Back Faux Leather Swivel Chair, Pneumatic Seat-Height Adjustment, Reclining Ergonomic Chair, LROC-028, Max 330 lbs. (Black) MADE TO LAST MATERIAL: constructed with 1 premium PU leather backrest, 1 supple leather upholstery seat pan, 2 comfortable padded armrests, 1 heavy-duty nylon base with 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 executive 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 to 110 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 high-back leather executive chair meets BIFMA standards and supports up to 330lbs of evenly distributed weight, its explosion-proof base plate with sturdy legs increase safety and stability