100% Polyester This mesh desk chair will be a comfortable ergonomic office chair for employees and executives alike. Offering up a 3-paddle control you'll reach your desired comfort in this adjustable office chair. [_Our chair conforms to ANSI/BIFMA standard X5.1-17_] Contemporary executive chairs offer superior comfort Ventilated curved back provides lumbar support, adjustable back height, back angle adjustments with infinite lock positions Tilt lever - push in to lock in an upright position; pullout to activate rocking motion, while tilt tension knob controls tilt resistance PRODUCT MEASUREMENTS: Overall Size (4): 25.75"W x 27.5"D x 36.75-43.5"H; Seat Size: 19"W x 17"D x 18-23"H; Back Size: 17.5"W x 19-21"H; Arm Size: 27-31.75"H from floor; 7.75-10.25"H from seat