Task chair provides an ergonomic solution with many comfort features, including pneumatic seat-height adjustment from 17-1/4" to 20-3/4", adjustable back height, 360-degree swivel, tilt, tilt tension, tilt lock and an asynchronous tilt control over seat and back. Seat size is 20-1/2" wide x 20-1/2" deep. Back measures 20" wide x 24-1/2". Included arms with urethane arm pads adjust in height and width. Distance between arms ranges from 18-1/8" x 21-3/8". Chair is upholstered with 100 percent polyester fabric. Black frame features a steel structure with polymer covering and five-star base with carpet casters.