Mid-back task chair with no arms offers style, durability and exceptional value without compromising comfort. To adjust this ergonomic chair to just the position you need, functions include pneumatic seat-height adjustment from 18-9/10" to 24", articulating seat and back, and curved height-adjustable ratchet back and tilt lock. Seat-angle adjustment will lock in any position from front to back. Forward seat tilt changes the angle of your thighs to the floor for full back support when working at a computer. Back and seat are upholstered in black fabric and feature 2-1/2" thick cushions. Back nylon, five-star base is equipped with smooth-rolling casters for easy mobility. Seat measures 20" wide x 17" deep. Back size is 17" wide x 18" high.