I used to sell high end office furniture. When I quit, I bought my favorite chair that they made. It is on casters, has adjustable seat height, arms that adjust up, down and swivel around totally out of the way. The back has adjustable lumbar support and the chair also has forward tilt. That allows the back to come FORWARD to support me even when I am leaning forward to sew...very important. Love it and wouldn't do without it! Its a Haworth chair.