Mid-back swivel chair features a heavy-duty mesh seat & mesh back that provides superior comfort with adjustable lumbar support & air circulation. Integrated seat slider lets you set the seat exactly where you want it. A two-paddle control provides one-touch, seat-height adjustment & five back-lock positions that let you adjust the chair to meet your specific preferences. Synchronized tilt control provides reduced, front edge rise while reclining. A convenient back lock prevents the back from reclining when desired. Fiberglass-infused, reinforced nylon base with high-performance casters delivers strength, support & comfort. Adjustable arms are sold separately. Weight capacity is 250 lb. Chair exceeds ANSI / BIFMA standards & is Greenguard Certified.