Managerial Mid-back Chair with Antimicrobial Seat features a mesh back for conforming comfort. Ergonomic mid-back matches the natural curvature of a person's back. Thick seat cushion is upholstered in healthcare-grade, antimicrobial vinyl so the chair lasts longer & it's easier to clean. Multifunction control adjusts seat & back angles independently with two levers for infinite locking within a fixed range. For more individualized comfort, arms adjust in height & width. Mid-back chair also offers a five-star nylon base, pneumatic seat-height adjustment (17" to 20-9/10" high from the floor), 360-degree swivel, back-height adjustment, tilt & asynchronous three-lever control. Frame is available in black only. Chair meets the CA117 fire-retardant standard & offers an abrasion rating of 60,000 double rubs (ASTM-D-4175).