VIVA OFFICE Mid Back Mesh Chair Ergonomic Desk Computer Chair Swivel Office Chair-Black Black ergonomic mid-back stylish design; breathable cooling mesh fabric Pneumatic gas lift for height adjustment and 360-Degree swivel; easily rock back and forth Durable 5 star base for greater stability; multi-direction wheel move smoothly and quietly without scratches 20.47 inch seat width with 2.36 inch resilient healthy sponge for all-day comfort Maximum weight capacity: 250 pounds; one-years free component-exchange