Volt task chair offers comfort, function, & style & adapts to each user with simple comfort controls for added flexibility. Generous proportions & a contoured back deliver optimal comfort. Functions include pneumatic seat-height adjustment, 360-degree swivel, tilt, tilt tension & tilt lock. Design includes a fully padded back & seat & 2-1/2" hooded dual-wheel casters. Seat size is 18-1/2" wide x 18-3/4" deep. Usable seat depth is 18-3/4". Seat-to-floor height ranges from 18" to 22-1/4". Distinctive V-shaped back measures 17-1/4" wide x 18-3/4" high from the seat. Chair also features a plastic outer back & black frame. Chair meets or exceeds applicable ANSI / BIFMA & ISTA performance standards. Height-adjustable arms are sold separately.