Adjustable chair back, seat, armrests, and seat back tilt and tension. Seat is height-adjustable from 17 5/8" to 22".  Assembles in minutes with no tools required. Weight capacity of up to 300 lb. Soft casters work on carpeted or wood floors. Tested to BIFMA X5.1 and meets or exceeds BIFMA's durability standards for office furniture.