Brimming in style our Fundamental Mesh Desk Chair is full of character with a pivoting back. No knob turning to implement the pivot back, push back to relax. [_Our chair conforms to ANSI/BIFMA standard X5.1-17_] Modern Design: inventive pivot back, mid-back with lumbar support, fixed t-arms Mesh comfort: designer ventilated back provides maximum breathability Pneumatic seat height lever, dual-wheel casters PRODUCT MEASUREMENTS: Overall Size: 23"W x 23"D x 31.5-36.25"H; Seat Size: 17"W x 16.75"D x 16-20.5"H; Back Size: 16"W x 16.5"H; Arm Size: 23.25-28"H from floor; 7.25"H from seat